Test Yourself About Muscles With Online Quiz

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1. What is the action of the brachioradialis?

Explanation

The brachioradialis is a muscle in the forearm that flexes the forearm, partially supinates and pronates it. It is responsible for movements such as bending the elbow and rotating the forearm to face the palm up or palm down positions.

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Test Yourself About Muscles With Online Quiz - Quiz

Do you know how many muscles are there in our body? What is the strongest muscle in the human body? Check out our online quiz to test yourself and learn interesting facts as you play.

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2. What innervates the vastus medialis?

Explanation

The correct answer is femoral because the vastus medialis muscle is innervated by the femoral nerve. The femoral nerve originates from the lumbar plexus and supplies motor innervation to the muscles of the anterior thigh, including the vastus medialis. It also provides sensory innervation to the skin of the anterior thigh and medial leg.

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3. What innervates the vastus intermedius?

Explanation

The correct answer is femoral because the vastus intermedius muscle is innervated by the femoral nerve. The femoral nerve is a major nerve of the lower limb that arises from the lumbar plexus and supplies motor innervation to the muscles of the anterior thigh, including the vastus intermedius.

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4. What is the action of the rectus abdominis?

Explanation

The rectus abdominis is a paired muscle located in the anterior abdominal wall. Its main action is to compress the abdomen, which helps in various activities like coughing, sneezing, and defecation. Additionally, it also flexes the vertebral column, which means it helps in bending the spine forward. This muscle is commonly known as the "six-pack" muscle and is responsible for maintaining posture and providing stability to the trunk.

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5. WHat is the action of the transversus abdominis?

Explanation

The action of the transversus abdominis is to compress the abdomen. This muscle is located deep within the abdomen and plays a crucial role in stabilizing the core and providing support to the spine. When the transversus abdominis contracts, it helps to flatten and tighten the abdominal area, which can be beneficial for activities that require core strength and stability, such as lifting heavy objects or maintaining good posture.

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6. Where does the pectoralis major originate?

Explanation

The pectoralis major muscle originates from the clavicle, sternum, and cartilage of ribs 2-6.

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7. Where does the deltoid originate?

Explanation

The deltoid muscle originates from the acromial extremity of the clavicle, the acromion, and the spine of the scapula.

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8. What is the action of the deltoid?

Explanation

The deltoid is a muscle located in the shoulder region. It is responsible for multiple actions including abduction (moving the arm away from the body), flexion (bringing the arm forward), extension (moving the arm backwards), medial rotation (rotating the arm inward), and lateral rotation (rotating the arm outward). These actions allow for a wide range of movements in the shoulder joint.

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9. What innervates the deltoid?

Explanation

The deltoid muscle is innervated by the axillary nerve. This nerve arises from the brachial plexus and provides motor innervation to the deltoid muscle, allowing for shoulder abduction and flexion. The other options listed (subscapular, lower subscapular, and accessory) do not innervate the deltoid muscle.

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10. What is the action of external oblique? 

Explanation

The external oblique muscle is responsible for both compressing the abdomen and laterally flexing the vertebral column. When both sides of the muscle contract together, they help to compress the abdomen, providing support and stability to the core. When only one side contracts, it laterally flexes or bends the vertebral column to the same side. This action allows for movements such as side bending or twisting of the torso.

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11. What is the action of latissimus dorsi?

Explanation

The latissimus dorsi muscle is responsible for extending, adducting, and medially rotating the humerus. This means that it helps to move the arm backward, bring it closer to the body, and rotate it inward.

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12. Where does the supraspinatus originate?

Explanation

The supraspinatus muscle originates from the supraspinous fossa of the scapula. This is a shallow depression located on the posterior side of the scapula, above the spine of the scapula. The muscle then attaches to the greater tubercle of the humerus in the shoulder joint.

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13. What is the action of the levator scapulae 

Explanation

The levator scapulae is a muscle located in the neck and upper back region. Its main action is to elevate the scapula, which means it helps to lift the shoulder blade towards the ear. Additionally, it also helps in rotating the scapula downwards. Therefore, the correct answer is "elevates scapula and rotates down".

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14. What is the pectoralis major innervated by?

Explanation

The pectoralis major is innervated by the medial and lateral pectoral nerves. These nerves arise from the brachial plexus and provide motor innervation to the pectoralis major muscle. The thoracodorsal nerve innervates the latissimus dorsi muscle, the lower subscapular nerve innervates the subscapularis muscle, and the axillary nerve innervates the deltoid and teres minor muscles. Therefore, the correct answer is medial/lateral pectoral.

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15. What innervates the supraspinatous?

Explanation

The supraspinatus muscle is innervated by the suprascapular nerve. This nerve originates from the upper trunk of the brachial plexus and passes through the suprascapular notch to reach the supraspinatus muscle. It provides motor innervation to the supraspinatus, allowing it to contract and assist in shoulder abduction and stabilization. The axillary nerve innervates the deltoid and teres minor muscles, the phrenic nerve innervates the diaphragm, and the radial nerve innervates the extensor muscles of the forearm.

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16. Where does the teres minor originate?

Explanation

The teres minor muscle originates from the inferior lateral border of the scapula.

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17. What is the action of adductor longus?

Explanation

The adductor longus is a muscle located in the inner thigh. Its main actions are flexion, adduction, and lateral rotation of the femur. Flexion refers to bending the leg at the hip joint, adduction refers to bringing the leg towards the midline of the body, and lateral rotation refers to rotating the leg outward. Therefore, the correct answer is flex, adducts, laterally rotates femur.

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18. What innervates the adductor brevis?

Explanation

The adductor brevis is innervated by the obturator nerve. The obturator nerve is a major nerve of the lower limb that arises from the lumbar plexus and provides motor innervation to the adductor muscles of the thigh, including the adductor brevis. This nerve also supplies sensory innervation to the skin of the medial aspect of the thigh. Therefore, the correct answer is obturator.

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19. What innervates the vastus lateralis?

Explanation

The vastus lateralis is innervated by the femoral nerve. The femoral nerve is a major nerve that originates from the lumbar plexus and supplies motor and sensory innervation to the muscles of the anterior thigh, including the vastus lateralis. It is responsible for the extension of the leg at the knee joint.

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20. What is the origin of the sternocleidomastoid?

Explanation

The sternocleidomastoid muscle originates from the sternum (breastbone) and clavicle (collarbone). It is a large muscle located in the front of the neck that helps with various movements of the head and neck.

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21. What is the insertion of the sternocleidomastoid?

Explanation

The insertion of the sternocleidomastoid muscle is the mastoid process of the temporal bone. This muscle originates from the sternum and clavicle, and its insertion at the mastoid process allows it to rotate and flex the head and neck.

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22. What innervates the bicep brachii?

Explanation

The correct answer is musculocutaneous. The musculocutaneous nerve is responsible for innervating the bicep brachii muscle. It originates from the brachial plexus and supplies motor innervation to the bicep brachii muscle, allowing it to contract and perform movements such as flexion at the elbow joint. The musculocutaneous nerve also provides sensory innervation to the skin on the lateral aspect of the forearm.

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23. What is the action of gluteus maximus?

Explanation

The gluteus maximus is a large muscle located in the buttocks. It is responsible for extending the femur, which means it helps to move the leg backwards. Additionally, it also abducts the femur, which means it moves the leg away from the midline of the body. It can also adduct the femur, which means it moves the leg towards the midline of the body. Lastly, the gluteus maximus laterally rotates the femur, which means it rotates the leg away from the midline of the body.

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24. What are the external intercostals innervated by? 

Explanation

The external intercostals are innervated by the intercostal nerves. These nerves are located between the ribs and provide motor and sensory innervation to the muscles and skin of the intercostal spaces. The intercostal nerves originate from the spinal cord and run along the lower border of each rib. They are responsible for the contraction of the external intercostal muscles during inspiration, helping to elevate the ribs and expand the thoracic cavity.

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25. What is the action of biceps brachii?

Explanation

The action of the biceps brachii is to flex the humerus and flex and supinate the forearm. This means that it is responsible for bending the upper arm at the elbow joint and rotating the forearm so that the palm faces upward.

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26. Where does the deltoid insert?

Explanation

The deltoid muscle is a large, triangular muscle located on the upper arm. It inserts at the deltoid tuberosity of the humerus, which is a bony prominence on the lateral side of the humerus. This tuberosity provides a strong attachment point for the deltoid muscle, allowing it to exert force and participate in movements of the shoulder joint.

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27. Where does the latissumus dorsi originate?

Explanation

The latissimus dorsi muscle originates from the spines of the 7th to 12th thoracic vertebrae, the sacral crest, and the ilium.

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28. What is the latissimus dorsi innervated by?

Explanation

The latissimus dorsi muscle is innervated by the thoracodorsal nerve. This nerve originates from the brachial plexus and supplies motor innervation to the latissimus dorsi muscle. The thoracodorsal nerve runs along the posterior wall of the axilla and travels through the latissimus dorsi muscle, providing the necessary nerve impulses for muscle contraction and movement.

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29. What is the action of brachialis?

Explanation

The action of the brachialis muscle is to flex the forearm. This means that it is responsible for bending the forearm at the elbow joint, bringing the hand closer to the shoulder. The brachialis works in conjunction with other muscles, such as the biceps brachii, to perform this movement.

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30. What innervates the brachioradialis?

Explanation

The brachioradialis muscle is innervated by the radial nerve. The radial nerve is responsible for supplying motor innervation to the muscles of the posterior compartment of the forearm, including the brachioradialis. It also provides sensory innervation to the posterior aspect of the forearm and hand. Therefore, the correct answer is radial.

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31. Where does the gluteus medius insert?

Explanation

The gluteus medius muscle inserts into the greater trochanter of the femur. The greater trochanter is a bony prominence on the upper part of the femur, and it serves as the attachment site for various muscles, including the gluteus medius. This muscle plays an important role in stabilizing the pelvis during walking and other lower limb movements.

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32. Where does the adductor brevis insert?

Explanation

The adductor brevis muscle inserts on the linea aspera. The linea aspera is a ridge on the posterior surface of the femur. It serves as the attachment point for various muscles, including the adductor brevis. Therefore, the correct answer is linea aspera.

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33. What is the action of the internal oblique?

Explanation

The internal oblique muscle is responsible for compressing the abdomen when both sides contract simultaneously. When only one side contracts, it laterally flexes the vertebral column. This means that the correct answer is "together compress abdomen, singly laterally flex vertebral column".

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34. What is the internal oblique innervated by?

Explanation

The internal oblique muscle is innervated by the T8-T12 spinal nerves, as well as the iliohypogastric and ilioinguinal nerves. These nerves provide the necessary motor and sensory input to the muscle, allowing it to contract and perform its functions. The T8-T12 spinal nerves originate from the thoracic region of the spinal cord and supply the muscles and skin of the abdominal wall. The iliohypogastric and ilioinguinal nerves also arise from the spinal cord and provide innervation to the lower abdomen and groin region.

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35. Where does the trapezius originate?

Explanation

The trapezius muscle originates from the occipital bone and the spinous processes of the seventh through twelfth thoracic vertebrae (C7-T12).

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36. Where does the rhomboid major originate?

Explanation

The rhomboid major muscle originates from the spines of the second to fifth thoracic vertebrae (T2-T5).

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37. What is the action of triceps brachii?

Explanation

The action of the triceps brachii is to extend the forearm and humerus. This muscle is located on the back of the upper arm and is responsible for straightening the arm at the elbow joint. When the triceps brachii contracts, it pulls on the forearm bone (ulna) and causes extension of the forearm. Additionally, it also assists in extending the upper arm at the shoulder joint by pulling on the humerus bone.

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38. What is the action of palmaris longus?

Explanation

The action of the palmaris longus is to flex the wrist. This means that it helps to bend the hand towards the palm side of the forearm.

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39. What is the action of flexor digitorum profundis?

Explanation

The action of the flexor digitorum profundis is to flex the distal phalanx of each finger.

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40. What is the sternocleidomastoid innervated by?

Explanation

The sternocleidomastoid muscle is innervated by the accessory nerve (cranial nerve XI) and the cervical spinal nerves C2 and C3.

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41. Where do the external intercostals insert?

Explanation

The external intercostals are muscles located between the ribs. They run obliquely downwards and forwards. They attach to the superior border of the rib below, which means that they insert onto the upper edge of the rib that is situated immediately below them. This attachment allows the external intercostals to elevate the rib cage during inspiration, aiding in the process of breathing.

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42. What is the action of the external intercostals?

Explanation

The action of the external intercostals is to elevate the ribs, which increases the lateral and anteroposterior dimensions of the thorax.

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43. What innervates the rectus femoris?

Explanation

The rectus femoris is innervated by the femoral nerve. This nerve is responsible for supplying motor and sensory innervation to the muscles in the anterior compartment of the thigh, including the rectus femoris. It originates from the lumbar plexus and travels through the pelvis and thigh to reach the muscle. Activation of the femoral nerve allows the rectus femoris to contract and participate in movements such as hip flexion and knee extension.

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44. Where does the supraspinatus inserT?

Explanation

The supraspinatus inserts on the greater tubercle of the humerus. This is the correct answer because the supraspinatus is one of the four muscles that make up the rotator cuff in the shoulder. It originates from the supraspinous fossa of the scapula and runs laterally to insert on the greater tubercle of the humerus. This insertion point allows the supraspinatus to assist in abduction and stabilization of the shoulder joint.

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45. What is the action of flexor digitorum superficialis?

Explanation

The action of the flexor digitorum superficialis is to flex the middle phalanx of each finger.

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46. What innervates the gluteus medius?

Explanation

The gluteus medius is innervated by the superior gluteal nerve. This nerve arises from the sacral plexus, specifically from the ventral rami of L4, L5, and S1 spinal nerves. It supplies motor innervation to the gluteus medius muscle, which is responsible for abduction and medial rotation of the hip joint.

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47. Where does the tensor fasciae latae insert?

Explanation

The tensor fasciae latae muscle inserts into the IT band, which then attaches to the tibia. The IT band is a thick band of connective tissue that runs along the outside of the thigh, and it helps to stabilize the knee joint. The greater trochanter of the femur is a bony prominence on the upper part of the thigh bone and is not directly involved in the insertion of the tensor fasciae latae.

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48. What innervates the adductor longus?

Explanation

The correct answer is "obturator." The obturator nerve innervates the adductor longus muscle.

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49. What is the action of the gracilis?

Explanation

The gracilis muscle is responsible for adducting the femur. Adduction refers to the movement of bringing a body part closer to the midline of the body. In this case, the gracilis muscle helps in pulling the femur towards the midline of the body. This action is important for movements such as crossing the legs or bringing the legs together.

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50. What is the action of vastus medialis?

Explanation

The action of vastus medialis is to extend the leg. This muscle is located in the thigh and is responsible for straightening the knee joint. When the vastus medialis contracts, it helps to extend the leg and bring it into a straight position. This action is important for activities such as walking, running, and standing upright.

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51. Where does the external oblique insert?

Explanation

The external oblique muscle inserts into the iliac crest and linea alba. The iliac crest is the upper curved border of the hip bone, while the linea alba is a fibrous band that runs vertically down the midline of the abdomen. The external oblique muscle is responsible for various movements of the trunk, including rotation and bending sideways. Its insertion at the iliac crest and linea alba allows it to exert force and contribute to these movements.

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52. What innervates the trapezius?

Explanation

The trapezius muscle is innervated by the accessory nerve, specifically the branches originating from the C3 and C4 spinal nerves. The accessory nerve controls the movement of the trapezius muscle, which is responsible for various movements of the shoulder and neck, such as shrugging the shoulders and rotating the head.

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53. Where does the rhomboid major insert?

Explanation

The rhomboid major muscle inserts on the vertebral border of the scapula below the spine. This means that the muscle attaches to the scapula bone along its inner edge, specifically below the spine of the scapula.

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54. What is the action of the pectoralis major?

Explanation

The pectoralis major is a large muscle located in the chest. It is responsible for multiple actions including flexing, medially rotating, and adducting the humerus. Flexion refers to bending the arm at the shoulder joint, medially rotation involves rotating the arm towards the midline of the body, and adduction is the movement of bringing the arm towards the center of the body. Therefore, the correct answer is flex, medially rotates, and adducts the humerus.

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55. Where does the biceps brachii originate?

Explanation

The biceps brachii muscle originates from the supraglenoid tubercle and coracoid process of the scapula.

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56. Where do the triceps brachii insert?

Explanation

The triceps brachii muscle is a large muscle located on the back of the upper arm. It is responsible for extending the forearm at the elbow joint. The insertion point of the triceps brachii muscle is the olecranon of the ulna, which is a bony prominence at the back of the elbow. This insertion allows the triceps brachii muscle to exert force and extend the forearm when contracted.

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57. What innervates triceps brachii?

Explanation

The triceps brachii is innervated by the radial nerve. This nerve originates from the brachial plexus and supplies the muscles in the posterior compartment of the arm, including the triceps. It provides motor innervation, allowing for extension of the elbow joint.

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58. What innervates the flexor digitorum profundis?

Explanation

The flexor digitorum profundis is innervated by both the median and ulnar nerves. These nerves supply motor fibers to the muscle, allowing it to flex the fingers. The median nerve primarily innervates the lateral two lumbricals and the lateral half of the flexor digitorum profundis, while the ulnar nerve innervates the medial two lumbricals and the medial half of the flexor digitorum profundis. This dual innervation ensures coordinated and precise finger flexion.

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59. What is the action of extensor digitorum?

Explanation

The action of the extensor digitorum is to extend the distal and middle phalanges of each finger. This means that it helps in straightening and extending the last two segments of the fingers, allowing for movements such as opening the hand or pointing the fingers.

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60. Where does the gluteus maximus originate?

Explanation

The gluteus maximus originates from the iliac crest, sacrum, and coccyx. These are the specific anatomical structures from which the muscle originates.

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61. What innervates the sartorius?

Explanation

The sartorius muscle is innervated by the femoral nerve. The femoral nerve is a major nerve in the leg that originates from the lumbar spine and supplies motor and sensory innervation to the muscles and skin of the anterior thigh and medial leg. The sartorius muscle is a long, thin muscle that runs diagonally across the front of the thigh and is responsible for flexing, abducting, and laterally rotating the hip joint.

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62. Where does the diaphragm originate?

Explanation

The diaphragm originates from the xiphoid, which is a small, cartilaginous extension at the lower end of the sternum. It is responsible for separating the thoracic cavity from the abdominal cavity and plays a crucial role in the process of respiration.

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63. Where does the teres minor insert?

Explanation

The teres minor muscle inserts into the greater tubercle of the humerus. This means that the muscle attaches to the bony prominence on the upper part of the humerus bone. This insertion point allows the teres minor muscle to contribute to the movement and stability of the shoulder joint, particularly in the action of rotating the arm externally.

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64. What is the action of vastus intermedius?

Explanation

The vastus intermedius is a muscle located in the thigh. Its main action is to extend the leg, which means it helps in straightening the leg at the knee joint. This muscle works in conjunction with other muscles of the quadriceps group to provide stability and power during activities such as walking, running, and jumping.

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65. Where does the sartorius originate?

Explanation

The sartorius muscle originates from the anterior superior iliac spine (ASIS). The ASIS is a bony prominence located on the front of the hip bone. The sartorius muscle is the longest muscle in the body and runs diagonally across the front of the thigh. Its origin at the ASIS allows it to flex, abduct, and laterally rotate the hip joint, as well as flex the knee joint. The other options listed, including the AIIS (anterior inferior iliac spine), linea aspera, and greater trochanter, are not the correct origins of the sartorius muscle.

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66. What is the action of rhomboid major?

Explanation

The action of the rhomboid major is to adduct the scapula and rotate it downward. This means that the muscle pulls the scapula towards the midline of the body and also helps in rotating it downwards.

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67. What innervates the rhomboid major?

Explanation

The rhomboid major muscle is innervated by the dorsal scapular nerve.

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68. Where does the levator scapulae insert?

Explanation

The levator scapulae muscle inserts into the superior vertebral border of the scapula. This means that the muscle attaches to the upper border of the scapula bone, which is located on the back side of the shoulder. The levator scapulae muscle helps to elevate and rotate the scapula, allowing for movements of the shoulder and upper back.

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69. Where do the external intercostals originate?

Explanation

The external intercostals originate from the inferior border of the ribs above.

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70. What is the action of the supraspinatous?

Explanation

The action of the supraspinatus muscle is to abduct the humerus. Abduction refers to moving the arm away from the body, such as when raising the arm to the side. The supraspinatus muscle is one of the rotator cuff muscles located in the shoulder joint, and its main function is to assist in the initiation of arm abduction.

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71. What is the action of teres major?

Explanation

The teres major muscle is responsible for extending, adducting, and medially rotating the humerus. This means that it helps to move the arm backward, bring it closer to the body, and rotate it inward.

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72. What innervates the teres minor?

Explanation

The axillary nerve innervates the teres minor muscle.

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73. Where does the biceps brachii insert?

Explanation

The biceps brachii muscle inserts at the radial tuberosity. This is a bony prominence located on the radius bone of the forearm. The biceps brachii muscle is responsible for flexing the elbow joint and supinating the forearm. Its insertion at the radial tuberosity allows it to exert force and control movement in these actions.

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74. Where does the brachialis insert?

Explanation

The brachialis muscle inserts on the tuberosity and coronoid process of the ulna. This means that the muscle attaches to these specific bony landmarks, allowing it to exert its pulling force on the ulna bone. The other options listed, such as the styloid process of the radius, lateral and posterior humerus, and flexor retinaculum, are not the correct insertion points for the brachialis muscle.

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75. Where does the brachioradialis insert?

Explanation

The brachioradialis muscle inserts at the styloid process of the radius.

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76. Which of the following is not included in the rotator cuff muscles?

Explanation

The rotator cuff muscles are a group of muscles that surround the shoulder joint and help to stabilize and move the shoulder. The supraspinatus, infraspinatus, teres minor, and subscapularis muscles are all part of the rotator cuff. However, the teres major muscle is not included in the rotator cuff muscles. It is a separate muscle that is located on the back of the shoulder and assists in movements such as pulling the arm down and back.

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77. What is the action of the extensor carpi radialis longus?

Explanation

The action of the extensor carpi radialis longus is to extend and adduct the hand at the wrist joint.

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78. What innervates the extensor carpi radialis longus?

Explanation

The extensor carpi radialis longus is innervated by the radial nerve. The radial nerve is responsible for providing motor innervation to the muscles in the posterior compartment of the forearm, including the extensor carpi radialis longus. It originates from the brachial plexus and travels down the arm, supplying various muscles along the way. In this case, it specifically innervates the extensor carpi radialis longus, which is responsible for extending and abducting the wrist.

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79. What innervates the extensor digitorum?

Explanation

The extensor digitorum muscle is innervated by the radial nerve. This nerve is responsible for providing motor innervation to the muscles of the posterior compartment of the forearm, including the extensor digitorum. It controls the extension of the fingers and wrist, allowing them to straighten and move away from the palm. The other options, ulnar, median, and deep radial, do not innervate the extensor digitorum muscle.

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80. What is the action of gluteus medius?

Explanation

The gluteus medius is a muscle located in the buttocks region. Its main action is to abduct the femur, which means it moves the leg away from the midline of the body. Additionally, it also helps in medially rotating the femur, which means it turns the leg inward. Therefore, the correct answer is "abducts, medially rotates femur."

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81. What is the action of adductor brevis?

Explanation

The adductor brevis is a muscle in the thigh that performs three actions: flexion, adduction, and lateral rotation of the femur. Flexion refers to bending the leg at the hip joint, adduction involves moving the leg towards the midline of the body, and lateral rotation means rotating the leg away from the midline. Therefore, the correct answer is "flex, adducts, laterally rotates femur."

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82. What innervates the adductor brevis?

Explanation

The correct answer is "obturator." The obturator nerve innervates the adductor brevis muscle.

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83. Where does the vastus lateralis insert?

Explanation

The vastus lateralis muscle inserts at the tibial tuberosity via the patellar tendon. This means that the muscle attaches to the bony prominence on the front of the tibia (shin bone) through the tendon that passes over the patella (kneecap). This insertion point allows the vastus lateralis muscle to exert force on the tibia, contributing to movements such as extending the leg at the knee joint.

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84. What is the action of vastus lateralis?

Explanation

The vastus lateralis is a muscle located in the thigh. Its main action is to extend the leg, which means it helps in straightening the leg at the knee joint. This muscle is one of the quadriceps muscles and works together with other muscles to provide stability and power during activities such as walking, running, and jumping.

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85. Where does the vastus intermedius insert?

Explanation

The vastus intermedius muscle inserts at the tibial tuberosity via the patellar tendon. This means that the muscle attaches to the bony prominence on the tibia called the tibial tuberosity, and this attachment is made possible through the patellar tendon. This tendon connects the patella (kneecap) to the tibia, allowing the vastus intermedius muscle to exert its force on the lower leg during movements such as extending the knee.

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86. What is the action of sartorius?

Explanation

The action of the sartorius muscle is to flex the leg and medially rotate the leg. It also flexes the femur laterally.

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87. Where does the rectus abdominis originate?

Explanation

The rectus abdominis is a paired muscle that is located in the anterior abdominal wall. It is responsible for flexing the trunk and compressing the abdominal contents. The muscle originates from the pubic crest and symphysis, which are located in the lower part of the pelvis. This origin allows the muscle to have a strong attachment and provide stability to the pelvis and lower abdomen.

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88. What is the transversus abdominis innervated by?

Explanation

The transversus abdominis muscle is innervated by the T8-T12 spinal nerves as well as the iliohypogastric and ilioguinal nerves.

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89. Where does the trapezius insert?

Explanation

The trapezius muscle inserts into the clavicle, acromion, and scapular spine. This means that the muscle attaches to these specific areas of the bones.

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90. WHere does the levator scapulae originate?

Explanation

The levator scapulae muscle originates from the superior aspect of the C4-C5 vertebrae.

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91. Where does the palmaris longus orginate?

Explanation

The palmaris longus muscle originates from the medial epicondyle of the humerus.

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92. Where does the flexor digitorum superficialis insert?

Explanation

The flexor digitorum superficialis muscle is responsible for flexing the fingers. It originates from the medial epicondyle of the humerus and inserts onto the middle phalanges of the four fingers (index, middle, ring, and little fingers). Therefore, the correct answer is middle phalanx.

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93. Where does the adductor brevis originate?

Explanation

The adductor brevis muscle originates from the inferior ramus of the pubis. This means that it starts from the lower part of the pubic bone.

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94. What is the action of rectus femoris?

Explanation

The rectus femoris is a muscle located in the thigh. It is responsible for two actions: extending the leg and flexing the femur. When the rectus femoris contracts, it helps to straighten the leg at the knee joint, allowing for the movement of leg extension. Additionally, it also assists in flexing the femur, which involves bringing the thigh towards the torso. Therefore, the correct answer is "extend leg, flex femur."

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95. Where does the transversus abdominis originate?

Explanation

The transversus abdominis muscle originates from the iliac crest, inguinal ligament, and cartilage of the last 6 ribs. This means that it attaches to these structures and originates from them, allowing it to play a role in stabilizing the trunk and compressing the abdominal contents.

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96. Where does the transversus abdominis insert?

Explanation

The transversus abdominis muscle inserts into the xiphoid and linea alba. The xiphoid is a small cartilaginous extension at the lower end of the sternum, while the linea alba is a fibrous band that runs vertically in the midline of the abdomen. These insertions allow the transversus abdominis to contribute to the support and stabilization of the abdominal wall.

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97. What innervates flexor digitorum superficialis?

Explanation

The correct answer is median. The median nerve innervates the flexor digitorum superficialis muscle. This muscle is responsible for flexing the fingers and is located in the forearm. The median nerve supplies motor innervation to this muscle, allowing it to contract and perform its function.

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98. Where does the extensor digitorum originate?

Explanation

The extensor digitorum muscle originates from the lateral epicondyle. This is the bony prominence on the outer side of the humerus bone in the upper arm. The extensor digitorum muscle is responsible for extending (straightening) the fingers, and it has tendons that run from the forearm to the fingers. The lateral epicondyle is the specific point of origin for this muscle, where it begins its attachment to the bone before extending down the forearm.

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99. Where does the vastus medialis originate?

Explanation

The vastus medialis muscle originates from the linea aspera. The linea aspera is a ridge on the posterior surface of the femur, which serves as an attachment point for various muscles including the vastus medialis. This muscle is one of the quadriceps muscles and plays a role in extending the knee joint.

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100. What is the external oblique innervated by?

Explanation

The external oblique muscle is innervated by the T7-T12 spinal nerves and the iliohypogastric nerve. These nerves provide motor and sensory innervation to the muscle, allowing it to contract and sense stimuli.

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101. What is the brachialis innervated by?

Explanation

The brachialis muscle is innervated by both the musculocutaneous and radial nerves. These nerves provide motor innervation to the muscle, allowing it to contract and contribute to elbow flexion. The musculocutaneous nerve originates from the brachial plexus and innervates the anterior compartment of the arm, including the brachialis muscle. The radial nerve also arises from the brachial plexus and innervates the posterior compartment of the arm, supplying motor fibers to the brachialis muscle as well. Therefore, the correct answer is musculocutaneous and radial.

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102. Where do the triceps brachii originate?

Explanation

The triceps brachii muscle originates from the infraglenoid tubercle of the humerus.

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103. What innervates the palmaris longus?

Explanation

The palmaris longus muscle is innervated by the median nerve. The median nerve is a major nerve in the upper limb that originates from the brachial plexus. It runs down the arm and supplies innervation to various muscles in the forearm, including the palmaris longus. This muscle is located in the palm of the hand and helps with wrist flexion and tensioning the palmar aponeurosis. Therefore, the correct answer is median.

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104. Where does the flexor digitorum profundis originate?

Explanation

The flexor digitorum profundis originates from the anterior medial ulna.

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105. What innervates the flexor pollucis longus?

Explanation

The flexor pollucis longus is innervated by the median nerve. The median nerve is responsible for innervating the muscles in the forearm, including the flexor pollucis longus. This nerve originates from the brachial plexus and travels down the arm, supplying motor and sensory innervation to various muscles and areas of the hand. Therefore, the correct answer is median.

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106. What innervates the psoas major?

Explanation

The psoas major is innervated by the L2-L3 spinal nerves. These spinal nerves arise from the lumbar region of the spinal cord and provide motor and sensory innervation to the psoas major muscle. The psoas major is a large muscle located in the lower back that plays a role in hip flexion and stabilization of the spine.

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107. Where does the adductor longus originate?

Explanation

The adductor longus muscle originates from the pubic symphysis and crest. The pubic symphysis is the joint between the two pubic bones in the pelvis, while the pubic crest is the bony ridge on the superior aspect of the pubic bone. These origins provide the attachment points for the adductor longus muscle, which plays a role in adducting the thigh and stabilizing the pelvis during movement. The other options listed, including the inferior ramus pubis, anterior inferior iliac spine, and greater trochanter, are not the correct origins of the adductor longus muscle.

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108. Where does the adductor longus insert?

Explanation

The adductor longus muscle inserts on the linea aspera, which is a ridge on the posterior surface of the femur. This is a well-known anatomical landmark where several muscles of the thigh attach.

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109. Where does the gracilis originate?

Explanation

The gracilis muscle is a long, thin muscle that is located in the inner thigh. It originates from the pubic symphysis, which is a joint located at the front of the pelvis. Therefore, the correct answer is pubic symphysis.

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110. Where does the vastus medialis insert?

Explanation

The vastus medialis is a muscle located in the thigh. It is one of the quadriceps muscles and is responsible for extending the knee. The muscle inserts on the tibial tuberosity, which is a bony prominence on the front of the tibia. The insertion occurs via the patellar tendon, which connects the muscle to the tibial tuberosity. This arrangement allows the vastus medialis to exert force on the tibia, facilitating knee extension.

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111. What is the action of the diaphragm?

Explanation

The action of the diaphragm is to pull the central tendon and increase thorax length during inspiration.

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112. What is the diaphragm innervated by?

Explanation

The diaphragm is innervated by the phrenic nerve. This nerve originates from the C3-C5 nerve roots in the cervical spine and travels down to the diaphragm. It provides the main motor innervation to the diaphragm, allowing for its contraction and relaxation during breathing. The accessory nerve is responsible for innervating the trapezius and sternocleidomastoid muscles, while the radial nerve supplies the muscles of the posterior arm and forearm. Therefore, these nerves are not directly involved in the innervation of the diaphragm.

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113. Where does the latissumus dorsi insert?

Explanation

The latissimus dorsi muscle inserts into the bicipital groove. This is the narrow groove located on the anterior side of the humerus bone, specifically in the area where the tendon of the long head of the biceps brachii muscle runs. The latissimus dorsi muscle plays a role in movements of the shoulder joint, such as extension, adduction, and medial rotation.

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114. Where does the flexor digitorum superficialis originate?

Explanation

The flexor digitorum superficialis originates from the medial epicondyle and the coronoid process of the ulna.

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115. What innervates the tensor fasciae latae?

Explanation

The tensor fasciae latae is innervated by the superior gluteal nerve. This nerve originates from the sacral plexus and supplies motor innervation to the gluteus medius, gluteus minimus, and tensor fasciae latae muscles. The superior gluteal nerve is responsible for controlling the movements and actions of these muscles, including the abduction and medial rotation of the hip joint.

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116. Where does the external oblique originate?

Explanation

The external oblique muscle originates from the lower 8 ribs. This muscle is located on the sides of the abdomen and plays a role in flexing and rotating the trunk. The lower 8 ribs serve as the attachment point for the external oblique muscle, allowing it to perform its functions effectively.

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117. Where does the brachioradialis originate?

Explanation

The brachioradialis muscle originates from the supracondylar ridge of the humerus.

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118. Where does the palmaris longus insert?

Explanation

The palmaris longus muscle inserts into the flexor retinaculum. The flexor retinaculum is a thick band of connective tissue located at the wrist. It helps to hold the tendons of the flexor muscles in place and provides support to the wrist joint. The palmaris longus muscle is located in the forearm, and its main function is to flex the wrist. By inserting into the flexor retinaculum, it is able to effectively contribute to the movement and stability of the wrist joint.

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119. Where does the flexor digitorum profundis insert?

Explanation

The flexor digitorum profundis muscle inserts at the bases of the distal phalanges. This means that it attaches to the bottom part of the bones in the fingers farthest from the hand. By inserting at this point, the muscle is able to flex or bend the middle phalanx of each finger.

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120. What is the action of flexor pollucis longus?

Explanation

The action of flexor pollucis longus is to flex the distal phalanx of the thumb. This means that it is responsible for bending the tip of the thumb towards the palm of the hand.

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121. Where does the extensor pollucis brevis insert?

Explanation

The extensor pollucis brevis muscle is responsible for extending the thumb. It originates from the ulna bone and inserts at the base of the proximal phalanx of the thumb. This allows it to exert force and extend the thumb at the joint between the metacarpal and the proximal phalanx.

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122. Where does the rectus femoris originate?

Explanation

The rectus femoris muscle originates from the anterior inferior iliac spine (AIIS).

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123. Where does the vastus lateralis originate?

Explanation

The vastus lateralis muscle originates from the greater trochanter and linea aspera. The greater trochanter is a bony prominence on the femur, while the linea aspera is a ridge on the posterior surface of the femur. These two points serve as attachment sites for the vastus lateralis muscle, which is one of the four muscles that make up the quadriceps femoris muscle group. The vastus lateralis is responsible for extending the leg at the knee joint.

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124. Where does the diaphragm insert?

Explanation

The diaphragm inserts into the central tendon.

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125. Where does the psoas major insert?

Explanation

The psoas major muscle inserts at the lesser trochanter of the femur. This is a bony prominence located on the inner side of the femur, just below the greater trochanter. The psoas major muscle originates from the lumbar vertebrae and passes through the pelvis before reaching its insertion point. Its main function is to flex the hip joint and assist in the movement of the thigh.

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126. WHere does the tensor fasciae latae originate?

Explanation

The tensor fasciae latae muscle originates from the iliac crest. This is the upper border of the ilium bone, which is part of the pelvis. The iliac crest provides attachment for various muscles, including the tensor fasciae latae, which helps to flex, abduct, and internally rotate the hip joint.

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127. Where does the rectus femoris insert?

Explanation

The rectus femoris muscle inserts into the superior border of the patella. This means that the muscle attaches to the upper edge of the kneecap.

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128. Where does the pectoralis major inserT?

Explanation

The pectoralis major muscle inserts on the greater tubercle and bicipital groove of the humerus. This means that the muscle attaches to these specific points on the upper arm bone.

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129. Where does the extensor carpi radialis longus inserT?

Explanation

The extensor carpi radialis longus muscle inserts into the 2nd metacarpal bone.

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130. Where does the extensor digitorum insert?

Explanation

The extensor digitorum muscle inserts on the 2-5 distal and middle phalanges.

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131. What is the action of the sternocleidomastoid?

Explanation

The action of the sternocleidomastoid muscle is cervical flexion.

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132. Where does the internal oblique originate?

Explanation

The internal oblique muscle originates from the iliac crest and the inguinal ligament.

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133. What is the action of the internal intercostals?

Explanation

The action of the internal intercostals is to depress the ribs, which means they pull the ribs downward. This action results in a decrease in the lateral and anteroposterior dimensions of the thorax.

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134. Where does the teres major insert?

Explanation

The teres major muscle inserts into the greater tubercle of the humerus. This is the correct answer because the teres major originates from the scapula and attaches to the humerus. Specifically, it inserts onto the posterior aspect of the greater tubercle, which is a bony prominence on the lateral side of the humerus. The teres major works in conjunction with other muscles to medially rotate and adduct the arm at the shoulder joint.

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135. What is the action of teres minor?

Explanation

The action of teres minor is to extend, adduct, and laterally rotate the humerus.

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136. Where does the brachialis originate?

Explanation

The brachialis muscle originates from the distal anterior humerus. This means that it starts at the lower part of the front side of the upper arm bone.

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137. Where does the psoas major originate?

Explanation

The psoas major muscle originates from the transverse processes and bodies of the lumbar vertebrae.

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138. Where does the gracilis insert?

Explanation

The gracilis muscle inserts on the medial tibia.

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139. Where does the rectus abdominis insert?

Explanation

The rectus abdominis is a long, flat muscle that extends vertically along the front of the abdomen. It originates from the pubic bone and inserts into the cartilage of ribs 5-7 and the xiphoid process. This means that the muscle attaches to the lower portion of the ribcage and the small bone at the bottom of the sternum.

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140. Where does the flexor pullicus longus insert?

Explanation

The flexor pollicis longus muscle is responsible for flexing the thumb. It originates from the anterior surface of the radius and inserts onto the base of the distal phalanx of the thumb. This insertion allows the muscle to exert its pulling force on the thumb, enabling flexion of the thumb joint. The other options mentioned, such as bases of the distal phalanx, middle phalanx, and palmar aponeurosis, are not the correct insertion points for the flexor pollicis longus muscle.

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141. What innervates the gluteus maximus?

Explanation

The gluteus maximus is innervated by the superior gluteal nerve. This nerve arises from the sacral plexus and originates from the spinal segments L4, L5, and S1. It supplies motor innervation to the gluteus maximus muscle, which is responsible for hip extension and external rotation.

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142. Where does the gluteus medius originate?

Explanation

The gluteus medius originates from the ilium.

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143. Where does the flexor pollucis longus originate?

Explanation

The flexor pollucis longus muscle originates from the anterior radius.

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144. Where does the extensor pollucis brevis originate?

Explanation

The extensor pollucis brevis muscle originates from the posterior, middle of the radius.

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145. What innervates the extensor pollucis brevis?

Explanation

The deep radial nerve innervates the extensor pollucis brevis muscle.

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146. Where does the gluteus maximus insert?

Explanation

not-available-via-ai

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147. Where does the teres major originate?

Explanation

The teres major muscle originates from the inferior angle of the scapula. This means that it starts from the bottom corner of the scapula bone.

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148. What innervates the teres major?

Explanation

The teres major muscle is innervated by the lower subscapular nerve. This nerve arises from the posterior cord of the brachial plexus and provides motor innervation to the teres major muscle. The lower subscapular nerve also innervates the subscapularis muscle, which lies deep to the teres major muscle. The other options, suprascapular, axillary, and thoracodorsal nerves, do not innervate the teres major muscle.

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149. What is the action of extensor pollucis brevis?

Explanation

The action of the extensor pollucis brevis muscle is to extend the proximal phalanx of the thumb. This means that it is responsible for straightening or stretching the first bone of the thumb away from the hand.

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150. What is the action of the tensor fasciae latae

Explanation

The tensor fasciae latae muscle is responsible for flexing and abducting the femur. Flexion refers to bending the leg at the hip joint, bringing the thigh closer to the abdomen. Abduction refers to moving the leg away from the midline of the body. Therefore, the action of the tensor fasciae latae is to flex and abduct the femur.

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151. Where does the vastus intermedius originate?

Explanation

The vastus intermedius muscle originates from the anterior and lateral femur.

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152. Where does the sartorius insert?

Explanation

The sartorius muscle inserts on the medial tibia.

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153. Where does the internal oblique insert?

Explanation

The internal oblique muscle inserts into the cartilage of the last 3-4 ribs.

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154. What is the action of the trapezius?

Explanation

The action of the trapezius muscle includes elevating the clavicle and head, as well as adducting, rotating, elevating, and depressing the scapula. Therefore, the correct answer is A and B.

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155. What is the action of the psoas major?

Explanation

The psoas major is a muscle located in the lower back and pelvis. Its main action is to flex the vertebrae, which means it helps to bend the spine forward. Additionally, it also flexes and laterally rotates the femur, which means it helps to bring the thigh forward and rotate it outward.

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156. Where does the extensor carpi radialis longus originate?

Explanation

The extensor carpi radialis longus originates from the lateral supracondylar ridge of the humerus.

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157. What is the rectus abdominis innervated by?

Explanation

The rectus abdominis is innervated by the thoracic spinal nerves T7-T12.

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What is the action of the brachioradialis?
What innervates the vastus medialis?
What innervates the vastus intermedius?
What is the action of the rectus abdominis?
WHat is the action of the transversus abdominis?
Where does the pectoralis major originate?
Where does the deltoid originate?
What is the action of the deltoid?
What innervates the deltoid?
What is the action of external oblique? 
What is the action of latissimus dorsi?
Where does the supraspinatus originate?
What is the action of the levator scapulae 
What is the pectoralis major innervated by?
What innervates the supraspinatous?
Where does the teres minor originate?
What is the action of adductor longus?
What innervates the adductor brevis?
What innervates the vastus lateralis?
What is the origin of the sternocleidomastoid?
What is the insertion of the sternocleidomastoid?
What innervates the bicep brachii?
What is the action of gluteus maximus?
What are the external intercostals innervated by? 
What is the action of biceps brachii?
Where does the deltoid insert?
Where does the latissumus dorsi originate?
What is the latissimus dorsi innervated by?
What is the action of brachialis?
What innervates the brachioradialis?
Where does the gluteus medius insert?
Where does the adductor brevis insert?
What is the action of the internal oblique?
What is the internal oblique innervated by?
Where does the trapezius originate?
Where does the rhomboid major originate?
What is the action of triceps brachii?
What is the action of palmaris longus?
What is the action of flexor digitorum profundis?
What is the sternocleidomastoid innervated by?
Where do the external intercostals insert?
What is the action of the external intercostals?
What innervates the rectus femoris?
Where does the supraspinatus inserT?
What is the action of flexor digitorum superficialis?
What innervates the gluteus medius?
Where does the tensor fasciae latae insert?
What innervates the adductor longus?
What is the action of the gracilis?
What is the action of vastus medialis?
Where does the external oblique insert?
What innervates the trapezius?
Where does the rhomboid major insert?
What is the action of the pectoralis major?
Where does the biceps brachii originate?
Where do the triceps brachii insert?
What innervates triceps brachii?
What innervates the flexor digitorum profundis?
What is the action of extensor digitorum?
Where does the gluteus maximus originate?
What innervates the sartorius?
Where does the diaphragm originate?
Where does the teres minor insert?
What is the action of vastus intermedius?
Where does the sartorius originate?
What is the action of rhomboid major?
What innervates the rhomboid major?
Where does the levator scapulae insert?
Where do the external intercostals originate?
What is the action of the supraspinatous?
What is the action of teres major?
What innervates the teres minor?
Where does the biceps brachii insert?
Where does the brachialis insert?
Where does the brachioradialis insert?
Which of the following is not included in the rotator cuff muscles?
What is the action of the extensor carpi radialis longus?
What innervates the extensor carpi radialis longus?
What innervates the extensor digitorum?
What is the action of gluteus medius?
What is the action of adductor brevis?
What innervates the adductor brevis?
Where does the vastus lateralis insert?
What is the action of vastus lateralis?
Where does the vastus intermedius insert?
What is the action of sartorius?
Where does the rectus abdominis originate?
What is the transversus abdominis innervated by?
Where does the trapezius insert?
WHere does the levator scapulae originate?
Where does the palmaris longus orginate?
Where does the flexor digitorum superficialis insert?
Where does the adductor brevis originate?
What is the action of rectus femoris?
Where does the transversus abdominis originate?
Where does the transversus abdominis insert?
What innervates flexor digitorum superficialis?
Where does the extensor digitorum originate?
Where does the vastus medialis originate?
What is the external oblique innervated by?
What is the brachialis innervated by?
Where do the triceps brachii originate?
What innervates the palmaris longus?
Where does the flexor digitorum profundis originate?
What innervates the flexor pollucis longus?
What innervates the psoas major?
Where does the adductor longus originate?
Where does the adductor longus insert?
Where does the gracilis originate?
Where does the vastus medialis insert?
What is the action of the diaphragm?
What is the diaphragm innervated by?
Where does the latissumus dorsi insert?
Where does the flexor digitorum superficialis originate?
What innervates the tensor fasciae latae?
Where does the external oblique originate?
Where does the brachioradialis originate?
Where does the palmaris longus insert?
Where does the flexor digitorum profundis insert?
What is the action of flexor pollucis longus?
Where does the extensor pollucis brevis insert?
Where does the rectus femoris originate?
Where does the vastus lateralis originate?
Where does the diaphragm insert?
Where does the psoas major insert?
WHere does the tensor fasciae latae originate?
Where does the rectus femoris insert?
Where does the pectoralis major inserT?
Where does the extensor carpi radialis longus inserT?
Where does the extensor digitorum insert?
What is the action of the sternocleidomastoid?
Where does the internal oblique originate?
What is the action of the internal intercostals?
Where does the teres major insert?
What is the action of teres minor?
Where does the brachialis originate?
Where does the psoas major originate?
Where does the gracilis insert?
Where does the rectus abdominis insert?
Where does the flexor pullicus longus insert?
What innervates the gluteus maximus?
Where does the gluteus medius originate?
Where does the flexor pollucis longus originate?
Where does the extensor pollucis brevis originate?
What innervates the extensor pollucis brevis?
Where does the gluteus maximus insert?
Where does the teres major originate?
What innervates the teres major?
What is the action of extensor pollucis brevis?
What is the action of the tensor fasciae latae
Where does the vastus intermedius originate?
Where does the sartorius insert?
Where does the internal oblique insert?
What is the action of the trapezius?
What is the action of the psoas major?
Where does the extensor carpi radialis longus originate?
What is the rectus abdominis innervated by?
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