Test Yourself About Muscles With Online Quiz

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

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.

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.

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.

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.

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

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.

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.

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.

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.

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

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.

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.

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

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.

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.

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.

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.

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

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.

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.

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

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."

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."

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

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.

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.

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.

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.

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.

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.

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

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."

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

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

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.

The axillary nerve innervates the teres minor muscle.

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.

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

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.

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.

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

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.

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

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

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

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

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.

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.

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

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.

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.

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.

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.

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.

The flexor digitorum profundis originates from the anterior medial ulna.

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.

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.

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.

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.

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.

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.

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.

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.

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

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.

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.

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.

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.

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.

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

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.

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.

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

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.

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.

The action of the sternocleidomastoid muscle is cervical flexion.

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

The diaphragm inserts into the central tendon.

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

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

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.

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.

The flexor pollucis longus muscle originates from the anterior radius.

The gluteus medius originates from the ilium.

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

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.

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.

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.

The gracilis muscle inserts on the medial tibia.

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.

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.

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.

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

The deep radial nerve innervates the extensor pollucis brevis muscle.

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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.