Mbi - Muscle Test 2
(7).webp "Mbi - Muscle Test 2 - Quiz")
Questions and Answers
- 1.
Which movement would lengthen the fibers of the biceps brachii?
- A.
Shoulder flexion
- B.
Elbow flexion
- C.
Pronation of the forearm
- D.
Lateral rotation of the shoulder
Correct Answer
C. Pronation of the forearmExplanation
Pronation of the forearm involves the rotation of the palm from a supine position to a prone position. This movement causes the biceps brachii muscle to lengthen because it is responsible for flexing the elbow joint. As the forearm rotates, the biceps brachii muscle stretches and lengthens, allowing for a greater range of motion in the elbow joint.Rate this question:
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- 2.
Which is the insertion of the biceps brachii?
- A.
Coronoid process of the ulna and aponeurosis of biceps brachii
- B.
Shaft of the ulna and aponeurosis of biceps brachii
- C.
Head of the radius and aponeurosis of biceps brachii
- D.
Tuberosity of radius and aponeurosis of biceps brachii
Correct Answer
D. Tuberosity of radius and aponeurosis of biceps brachiiExplanation
The insertion of the biceps brachii is the tuberosity of the radius and the aponeurosis of the biceps brachii.Rate this question:
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- 3.
Which of the following is an action of the biceps brachii?
- A.
Flex the elbow
- B.
Pronate the forearm
- C.
Depress the scapula
- D.
Abduct the shoulder
Correct Answer
A. Flex the elbowExplanation
The biceps brachii is a muscle located in the upper arm that is responsible for flexing the elbow joint. When the biceps brachii contracts, it causes the forearm to move towards the upper arm, resulting in the bending of the elbow. This action is commonly used in activities such as lifting objects or performing bicep curls.Rate this question:
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- 4.
What is the thin sheet of fascia extending off the distal tendon of the biceps brachii?
- A.
Bicipital retinaculum
- B.
Bicipital periosteum
- C.
Bicipital aponeurosis
- D.
Bicipital perimysium
Correct Answer
C. Bicipital aponeurosisExplanation
The thin sheet of fascia that extends off the distal tendon of the biceps brachii is called the bicipital aponeurosis. This structure helps to strengthen and stabilize the distal tendon of the biceps brachii, providing support and preventing excessive movement. It acts as a continuation of the tendon and helps to distribute the forces generated by the muscle. The bicipital aponeurosis also serves as an attachment site for other muscles and fascial layers in the arm.Rate this question:
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- 5.
Which is the origin of the brachialis?
- A.
Distal half of anterior surface of humerus
- B.
Posterior shaft of humerus
- C.
Proximal half of anterior surface of humerus
- D.
Medial shaft of humerus
Correct Answer
A. Distal half of anterior surface of humerusExplanation
The brachialis muscle originates from the distal half of the anterior surface of the humerus. This means that it has its attachment point on the lower half of the front side of the upper arm bone.Rate this question:
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- 6.
Which is the insertion of the brachialis?
- A.
Medial epicondyle of humerus
- B.
Tuberosity and coronoid process of ulna
- C.
Head of radius
- D.
Radial tuberosity
Correct Answer
B. Tuberosity and coronoid process of ulnaExplanation
The insertion of the brachialis muscle is on the tuberosity and coronoid process of the ulna. This means that the brachialis muscle attaches to these specific parts of the ulna bone.Rate this question:
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- 7.
Which of the following is an action of the brachialis?
- A.
Flex the elbow
- B.
Pronate the forearm
- C.
Extend the elbow
- D.
Supinate the forearm
Correct Answer
A. Flex the elbowExplanation
The brachialis is a muscle located in the upper arm. Its main action is to flex the elbow joint, which means it is responsible for bending the arm at the elbow. This action is important for various everyday activities such as lifting objects, throwing a ball, or performing bicep curls. The brachialis works in conjunction with other muscles in the arm to provide strength and stability during elbow flexion.Rate this question:
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- 8.
Which muscle creates a helpful dividing line between the flexors and extensors of the wrist and hand?
- A.
Brachioradialis
- B.
Brachialis
- C.
Coracobrachialis
- D.
Biceps brachii
Correct Answer
A. BrachioradialisExplanation
The brachioradialis muscle is located in the forearm and runs along the lateral side of the arm. It acts as a dividing line between the flexors and extensors of the wrist and hand. This muscle helps to stabilize the wrist and assist in movements such as flexion and extension. It is an important muscle for maintaining proper alignment and balance between the flexor and extensor muscles in the forearm.Rate this question:
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- 9.
Which is the origin of the brachiordialis?
- A.
Distal shaft of humerus
- B.
Medial epicondyle of humerus
- C.
Medial supracondylar ridge of humerus
- D.
Proximal two-thirds of the lateral supracondylar ridge of humerus
Correct Answer
D. Proximal two-thirds of the lateral supracondylar ridge of humerusExplanation
The origin of the brachiordialis is the proximal two-thirds of the lateral supracondylar ridge of the humerus.Rate this question:
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- 10.
Which is the insertion of the brachioradialis?
- A.
Styloid process of radius
- B.
Coronoid process of ulna
- C.
Neck of radius
- D.
Head of radius
Correct Answer
A. Styloid process of radiusExplanation
The brachioradialis muscle is inserted into the styloid process of the radius. This insertion point allows the muscle to assist in the flexion of the forearm at the elbow joint. The styloid process is a bony projection located on the lateral side of the distal end of the radius bone.Rate this question:
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- 11.
Which of the following is an action of the brachioradialis?
- A.
Extend of the elbow
- B.
Flex the wrist
- C.
Flex the elbow
- D.
Extend the wrist
Correct Answer
C. Flex the elbowExplanation
The brachioradialis is a muscle located in the forearm. Its main action is to flex the elbow joint. When the brachioradialis contracts, it helps to bend the forearm towards the upper arm. This muscle is responsible for movements such as lifting objects or performing a bicep curl. It does not have any significant role in extending the elbow, flexing the wrist, or extending the wrist.Rate this question:
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- 12.
The origin of the deltoid is identical to the insertion of which muscle?
- A.
Brachialis
- B.
Trapezius
- C.
Supraspinatus
- D.
Pectoralis major
Correct Answer
B. TrapeziusExplanation
The deltoid muscle originates from the lateral third of the clavicle, acromion, and spine of the scapula. The insertion of the deltoid is on the deltoid tuberosity of the humerus. The trapezius muscle, on the other hand, originates from the occipital bone, spinous processes of the cervical and thoracic vertebrae, and the ligamentum nuchae. It inserts onto the clavicle, acromion, and spine of the scapula. Therefore, the origin of the deltoid is identical to the insertion of the trapezius muscle.Rate this question:
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- 13.
Which statement about the deltoid is NOT correct?
- A.
It can act as an antagonist t itself.
- B.
Its posterior fibers laterally rotate the shoulder.
- C.
Its anterior fibers horizontally abduct the shoulder.
- D.
Its posterior fibers extend the shoulder.
Correct Answer
C. Its anterior fibers horizontally abduct the shoulder.Explanation
The deltoid muscle is responsible for various movements of the shoulder joint. Its anterior fibers primarily flex and medially rotate the shoulder, while its posterior fibers extend and laterally rotate the shoulder. However, the statement that its anterior fibers horizontally abduct the shoulder is incorrect. The anterior fibers of the deltoid are involved in shoulder flexion, not horizontal abduction. Horizontal abduction is mainly performed by the posterior fibers of the deltoid.Rate this question:
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- 14.
Which shoulder movement would lengthen the anterior fibers of the deltoid?
- A.
Extension
- B.
Flexion
- C.
Medial rotation
- D.
Horizontal adduction
Correct Answer
A. ExtensionExplanation
Extension is the correct answer because it involves moving the shoulder joint backward, which stretches and lengthens the anterior fibers of the deltoid muscle.Rate this question:
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- 15.
Which is the origin of the deltoid?
- A.
Shaft of clavicle, acromion and superior angle of scapula
- B.
Medial two-thirds of clavicle, angle of acromion and spine of scapula
- C.
Lateral one-third of clavicle, acromion and spine of scapula
- D.
Medial one-third of clavicle, lateral border of scapula
Correct Answer
C. Lateral one-third of clavicle, acromion and spine of scapulaExplanation
The deltoid muscle originates from the lateral one-third of the clavicle, the acromion, and the spine of the scapula. This means that these three structures provide the attachment site for the deltoid muscle, allowing it to perform its functions such as shoulder abduction and flexion. The other options mentioned do not accurately describe the origin of the deltoid muscle.Rate this question:
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- 16.
Which is the insertion of the deltoid?
- A.
Greater tubercle of humerus
- B.
Deltoid tuberosity
- C.
Coracoid process of scapula
- D.
Lesser tubercle of humerus
Correct Answer
B. Deltoid tuberosityExplanation
The insertion of the deltoid muscle is the deltoid tuberosity. The deltoid tuberosity is a rough, bony prominence located on the lateral side of the humerus, towards the middle of the bone. This is where the tendon of the deltoid muscle attaches, allowing it to exert its action on the arm. The deltoid muscle is responsible for various movements of the shoulder joint, including abduction, flexion, and extension.Rate this question:
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- 17.
Which of the following is an action of all fibers of the deltoid?
- A.
Abduct the shoulder
- B.
Extend the shoulder
- C.
Pronate the shoulder
- D.
Medially rotate the shoulder
Correct Answer
A. Abduct the shoulderExplanation
The deltoid is a muscle located in the shoulder that is responsible for various movements of the arm. One of its main actions is to abduct the shoulder, which means to move the arm away from the body. This movement is commonly seen when raising the arm sideways. Therefore, the correct answer is "abduct the shoulder".Rate this question:
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- 18.
In anatomical position, you will find the extensor group on which portion of the forearm?
- A.
Posterior / lateral
- B.
Anterior / medial
- C.
The distal half
- D.
The "bald" side
Correct Answer
A. Posterior / lateralExplanation
In anatomical position, the extensor group is located on the posterior/lateral portion of the forearm. This means that the extensor muscles, which are responsible for extending the wrist and fingers, are found on the back side (posterior) and outer side (lateral) of the forearm.Rate this question:
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- 19.
Compared to the flexor group, how do the muscles of the extensor group tend to feel during palpation?
- A.
Thicker and more pliable
- B.
Almost identical
- C.
Smaller and more sinewy
- D.
Larger and easy to differentiate
Correct Answer
C. Smaller and more sinewyExplanation
The muscles of the extensor group tend to feel smaller and more sinewy compared to the flexor group during palpation. This means that they are thinner and have a more fibrous texture.Rate this question:
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- 20.
Which muscle is a complete synergist with the latissimus dorsi and is sometimes called "lat's little helper"?
- A.
Teres minor
- B.
Teres major
- C.
Infraspinatus
- D.
Trapezius
Correct Answer
B. Teres majorExplanation
The teres major muscle is a complete synergist with the latissimus dorsi, meaning that it assists and works together with the latissimus dorsi to perform certain movements. It is sometimes referred to as "lat's little helper" because it helps the latissimus dorsi in actions such as extending, adducting, and internally rotating the arm at the shoulder joint. The teres major muscle is located on the back of the upper arm and is responsible for various movements involving the shoulder.Rate this question:
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- 21.
Which of the following is a part of the origin of the latissimus dorsi?
- A.
Lateral border of scapula
- B.
Anterior superior iliac crest
- C.
Greater tubercle of humerus
- D.
Thoracolumbar aponeurosis
Correct Answer
D. Thoracolumbar aponeurosisExplanation
The latissimus dorsi muscle originates from the thoracolumbar aponeurosis. The thoracolumbar aponeurosis is a broad, flat tendon that covers the lower back and connects to the spine and the iliac crest. It serves as an attachment point for several muscles, including the latissimus dorsi. This muscle plays a role in shoulder extension, adduction, and medial rotation, as well as in stabilizing the lower back. The other options listed (lateral border of scapula, anterior superior iliac crest, and greater tubercle of humerus) are not part of the origin of the latissimus dorsi muscle.Rate this question:
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- 22.
Which is the insertion of the latissimus dorsi
- A.
Intertubercular groove of the humerus
- B.
Crest of the greater tubercle of humerus
- C.
Shaft of the humerus
- D.
Angle of acromion
Correct Answer
A. Intertubercular groove of the humerusExplanation
The correct answer is the intertubercular groove of the humerus. The latissimus dorsi muscle is a large muscle of the back that originates from the lower back and inserts into the upper arm. It attaches to the humerus bone by inserting into the intertubercular groove, which is a groove located between the two tubercles of the humerus bone. This attachment allows the latissimus dorsi muscle to play a role in various movements of the shoulder and arm, such as extension, adduction, and internal rotation.Rate this question:
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- 23.
Which of the following is an action of the latissimus dorsi?
- A.
Flex the shoulder
- B.
Elevate the scapula
- C.
Abduct the shoulder
- D.
Medially rotate the shoulder
Correct Answer
D. Medially rotate the shoulderExplanation
The latissimus dorsi muscle is responsible for medially rotating the shoulder. This action involves bringing the arm closer to the midline of the body, as if reaching across the chest. The other options listed - flexing the shoulder, elevating the scapula, and abducting the shoulder - are not actions of the latissimus dorsi. Flexing the shoulder refers to bending the arm at the shoulder joint, elevating the scapula refers to raising the shoulder blade, and abducting the shoulder refers to moving the arm away from the midline of the body.Rate this question:
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- 24.
Which of the following is a part of the origin of the teres major?
- A.
Upper half of lateral border of scapula
- B.
Medial side of inferior angle
- C.
Lower half of lateral border of scapula
- D.
Infraspinous fossa
Correct Answer
C. Lower half of lateral border of scapulaExplanation
The teres major muscle originates from the lower half of the lateral border of the scapula. This means that it starts from the lower portion of the side of the scapula bone.Rate this question:
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- 25.
Which is the insertion of the teres major?
- A.
Greater tubercle of the humerus
- B.
Head of the humerus
- C.
Crest of the lesser tubercle of the humerus
- D.
Supraglenoid tubercle of the humerus
Correct Answer
C. Crest of the lesser tubercle of the humerusExplanation
The teres major muscle inserts on the crest of the lesser tubercle of the humerus. The crest of the lesser tubercle is a bony prominence located on the anterior aspect of the humerus, just below the greater tubercle. The teres major muscle originates from the inferior angle of the scapula and attaches to the crest of the lesser tubercle, playing a role in shoulder adduction, extension, and medial rotation.Rate this question:
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- 26.
Which of the following is an action of the teres major?
- A.
Extend the shoulder
- B.
Depress the scapula
- C.
Flex the shoulder
- D.
Laterally rotate the shoulder
Correct Answer
A. Extend the shoulderExplanation
The teres major muscle is responsible for extending the shoulder joint. This action involves moving the arm backward, away from the body. The other options listed are incorrect because the teres major does not depress the scapula, flex the shoulder, or laterally rotate the shoulder.Rate this question:
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- 27.
Which is the origin of the levator scapula?
- A.
Transverse porcesses of 1st - 4th cervical vertebrae
- B.
Spinous processes of 1st - 4th cervical vertebrae
- C.
Transverse processes of 3rd - 7th cervical vertebrae
- D.
Medial border of the scapula
Correct Answer
A. Transverse porcesses of 1st - 4th cervical vertebraeExplanation
The levator scapula originates from the transverse processes of the 1st - 4th cervical vertebrae.Rate this question:
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- 28.
Which is the insertion of the levator scapula?
- A.
Superior angle of scapula
- B.
Upper region of lateral border of the scapula
- C.
Medial border of scapula, between superior angle and superior portion of spine of scapula
- D.
Acromion of the scapula and superior portion of spine of scapula
Correct Answer
C. Medial border of scapula, between superior angle and superior portion of spine of scapulaExplanation
The insertion of the levator scapula is on the medial border of the scapula, between the superior angle and superior portion of the spine of the scapula.Rate this question:
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- 29.
Which of the following is an action of the levator scapula?
- A.
Rotate head and neck to the opposite side
- B.
Upwardly rotate the scapula
- C.
Elevate the scapula
- D.
Depress the scapula
Correct Answer
C. Elevate the scapulaExplanation
The levator scapula is a muscle responsible for elevating the scapula, which means it helps to lift the shoulder blade upwards. This action is important for various movements of the shoulder and arm, such as lifting objects or reaching overhead. The other options mentioned in the question, such as rotating the head and neck to the opposite side or depressing the scapula, are not actions of the levator scapula.Rate this question:
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- 30.
In which part of the body does lateral flexion occur?
- A.
Shoulder joint
- B.
Scapula
- C.
Axial skeleton
- D.
Feet
Correct Answer
C. Axial skeletonExplanation
Lateral flexion refers to the movement of bending the body sideways. This movement primarily occurs in the axial skeleton, which includes the skull, vertebral column, and rib cage. The shoulder joint allows for movement in multiple directions but is not specifically responsible for lateral flexion. The scapula is a bone in the shoulder girdle and does not directly participate in lateral flexion. The feet are not involved in lateral flexion as they primarily provide support and balance. Therefore, the axial skeleton is the correct answer as it is the main region where lateral flexion occurs.Rate this question:
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- 31.
Which muscle helps to create downward rotation of the scapula?
- A.
Levator scapula
- B.
Trapezius
- C.
Subscapularis
- D.
Teres minor
Correct Answer
A. Levator scapulaExplanation
The levator scapula muscle helps to create downward rotation of the scapula. This muscle is located at the back and side of the neck and attaches to the scapula. When it contracts, it pulls the scapula downward, helping to rotate it in a downward direction. This movement is important for various activities that require the scapula to move and stabilize the shoulder joint, such as reaching overhead or pulling objects towards the body.Rate this question:
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- 32.
Which muscle is divided into three segments: clavicular, sternal and costal?
- A.
Trapezius
- B.
Pectoralis minor
- C.
Pectoralis major
- D.
Serratus anterior
Correct Answer
C. Pectoralis majorExplanation
The pectoralis major muscle is divided into three segments: clavicular, sternal, and costal. These segments refer to the different attachments of the muscle. The clavicular segment attaches to the clavicle, the sternal segment attaches to the sternum, and the costal segment attaches to the ribs. This division allows for different actions and movements of the muscle.Rate this question:
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- 33.
Which of the following is a part of the origin of the pectoralis major?
- A.
Cartilage of ribs 7 - 12
- B.
Medial half of clavicle and sternum
- C.
Sternum, xiphoid process and linea alba
- D.
Lateral half of clavicle and coracoid process
Correct Answer
B. Medial half of clavicle and sternumExplanation
The pectoralis major is a large muscle in the chest region. It originates from the medial half of the clavicle (collarbone) and the sternum (breastbone). This means that the muscle attaches to and originates from these two bones. The other options listed, such as the cartilage of ribs 7-12, the sternum, xiphoid process, and linea alba, and the lateral half of the clavicle and coracoid process, are not part of the origin of the pectoralis major. Therefore, the correct answer is the medial half of the clavicle and sternum.Rate this question:
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- 34.
Which is the insertion of the pectoralis major?
- A.
Crest of greater tubercle of humerus
- B.
Lesser tubercle of humerus
- C.
Shaft of the humerus
- D.
Intertubercular groove of humerus
Correct Answer
A. Crest of greater tubercle of humerusExplanation
The insertion of the pectoralis major is the crest of the greater tubercle of the humerus. The pectoralis major is a large muscle located in the chest area and is responsible for movements of the shoulder joint, such as flexion, adduction, and medial rotation. Its insertion on the crest of the greater tubercle allows it to exert force and control these movements of the arm.Rate this question:
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- 35.
Which of the following is an action of the pectoralis major's upper fibers?
- A.
Horizontally abduct the shoulder
- B.
Horizontally adduct the shoulder
- C.
Extend the shoulder
- D.
Laterally rotate the shoulder
Correct Answer
B. Horizontally adduct the shoulderExplanation
The pectoralis major's upper fibers are responsible for horizontally adducting the shoulder. This means that they bring the arm closer to the midline of the body when it is already abducted or extended. This action is commonly seen when hugging someone or crossing the arms in front of the body.Rate this question:
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- 36.
The pectoralis minor is located deep to which muscle?
- A.
Serratus anterior
- B.
Pectoralis major
- C.
Deltoid
- D.
Trapezius
Correct Answer
B. Pectoralis majorExplanation
The pectoralis minor is located deep to the pectoralis major muscle. The pectoralis major is a large muscle that covers the upper part of the chest, while the pectoralis minor is a smaller muscle that lies underneath it. This arrangement allows the pectoralis major to provide the main bulk and strength to the chest, while the pectoralis minor assists in movements of the shoulder and scapula.Rate this question:
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- 37.
The pectoralis minor attaches to which bony landmark?
- A.
Coracoid process
- B.
Greater tubercle
- C.
Lesser tubercle
- D.
Infraglenoid
Correct Answer
A. Coracoid processExplanation
The pectoralis minor attaches to the coracoid process, which is a bony landmark located on the scapula. This attachment helps in stabilizing the scapula and also assists in movements of the shoulder joint. The coracoid process serves as an important point of attachment for various muscles, ligaments, and tendons in the shoulder region.Rate this question:
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- 38.
Which is the insertion of the pectoralis minor?
- A.
Greater tubercle of humerus
- B.
Medial portion of clavicle
- C.
Acromion of scapula
- D.
Medial surface of coracoid process of scapula
Correct Answer
D. Medial surface of coracoid process of scapulaExplanation
The pectoralis minor muscle inserts on the medial surface of the coracoid process of the scapula. This means that the muscle attaches to the inner side of the coracoid process, which is a bony projection on the scapula. The other options, such as the greater tubercle of the humerus, medial portion of the clavicle, and acromion of the scapula, are not the correct insertion points for the pectoralis minor muscle.Rate this question:
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- 39.
Which muscle is located in the space between the vertebral column and scapula?
- A.
Serratus anterior
- B.
Rhomboids
- C.
Levator scapula
- D.
Latissimus dorsi
Correct Answer
B. RhomboidsExplanation
The rhomboids are the muscles located in the space between the vertebral column and scapula. These muscles play a crucial role in retracting the scapulae (pulling them towards the spine) and stabilizing the shoulder blades. They work together with other muscles to maintain proper posture and facilitate movements of the upper back and shoulders. The serratus anterior muscle is located along the lateral sides of the rib cage, the levator scapulae muscle elevates the scapula, and the latissimus dorsi muscle is located on the back and helps with movements of the shoulder joint.Rate this question:
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- 40.
The rhomboids are superficial to the erector spinae and deep to which muscle?
- A.
Trapezius
- B.
Serratus anterior
- C.
Latissimus dorsi
- D.
Levator scapula
Correct Answer
A. TrapeziusExplanation
The rhomboids are located between the erector spinae muscles and the trapezius muscle. They are superficial to the erector spinae and deep to the trapezius muscle.Rate this question:
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- 41.
Which of the rotator cuff muscles attach to the lesser tubercle?
- A.
Supraspinatus
- B.
Infraspinatus
- C.
Teres minor
- D.
Subscapularis
Correct Answer
D. SubscapularisExplanation
The subscapularis muscle attaches to the lesser tubercle. The rotator cuff muscles are a group of muscles that surround the shoulder joint and help to stabilize and move the shoulder. The subscapularis muscle is located on the anterior side of the scapula and is responsible for internal rotation of the shoulder joint. It originates from the subscapular fossa of the scapula and inserts onto the lesser tubercle of the humerus.Rate this question:
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- 42.
What is the shared attachment site for three out of four rotator cuff muscles?
- A.
Deltoid tuberosity
- B.
Acromion
- C.
Greater tubercle
- D.
Coracoid process
Correct Answer
C. Greater tubercleExplanation
The greater tubercle is the shared attachment site for three out of four rotator cuff muscles. The rotator cuff muscles include the supraspinatus, infraspinatus, teres minor, and subscapularis. The supraspinatus, infraspinatus, and teres minor muscles all attach to the greater tubercle of the humerus bone. This attachment allows these muscles to help stabilize and move the shoulder joint. The coracoid process is not a shared attachment site for the rotator cuff muscles.Rate this question:
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- 43.
Which rotator cuff muscle creates shoulder abduction?
- A.
Supraspinatus
- B.
Infraspinatus
- C.
Teres minor
- D.
Subscapularis
Correct Answer
A. SupraspinatusExplanation
The supraspinatus muscle is responsible for shoulder abduction. It is one of the four muscles that make up the rotator cuff, located on the top of the shoulder blade. When the supraspinatus muscle contracts, it helps to lift the arm away from the body, allowing for abduction of the shoulder joint. This muscle is commonly involved in rotator cuff injuries and is important for maintaining shoulder stability and range of motion.Rate this question:
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- 44.
Which shoulder movement would shorten the fibers of the infraspinatus?
- A.
Medial rotation
- B.
Abduction
- C.
Lateral rotation
- D.
Flexion
Correct Answer
C. Lateral rotationExplanation
Lateral rotation would shorten the fibers of the infraspinatus. The infraspinatus is one of the muscles responsible for rotating the shoulder. Lateral rotation refers to the movement of rotating the shoulder away from the midline of the body. When the shoulder is laterally rotated, the fibers of the infraspinatus muscle are contracted and shortened, causing the movement.Rate this question:
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- 45.
Which shoulder movement would shorten the fibers of the supraspinatus?
- A.
Flexion
- B.
Extension
- C.
Adduction
- D.
Abduction
Correct Answer
D. AbductionExplanation
Abduction is the correct answer because it refers to the movement of the arm away from the midline of the body. When the arm is abducted, the fibers of the supraspinatus muscle are shortened. This muscle is located on the top of the shoulder and is responsible for initiating the movement of abduction. By shortening its fibers, the supraspinatus helps to lift the arm away from the body.Rate this question:
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- 46.
Which shoulder movement would lengthen the fibers of subscapularis?
- A.
Extension
- B.
Adduction
- C.
Lateral rotation
- D.
Horizontal abduction
Correct Answer
C. Lateral rotationExplanation
Lateral rotation would lengthen the fibers of subscapularis. This movement involves rotating the shoulder joint outward, away from the midline of the body. By performing lateral rotation, the subscapularis muscle, which is located on the front of the shoulder, is stretched and its fibers are lengthened. This movement helps to maintain the flexibility and range of motion of the shoulder joint.Rate this question:
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- 47.
Which is the origin of the supraspinatus?
- A.
Supraspinous fossa of scapula
- B.
Lesser tubercle of humerus
- C.
Supraspinous crest of scapula
- D.
Greater tubercle of humerus
Correct Answer
A. Supraspinous fossa of scapulaExplanation
The supraspinatus muscle originates from the supraspinous fossa of the scapula. This is a shallow depression located on the posterior aspect of the scapula, above the spine of the scapula. The supraspinatus muscle plays an important role in shoulder abduction and stabilization of the shoulder joint.Rate this question:
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- 48.
Which is the insertion of the supraspinatus?
- A.
Coracoid process of scapula
- B.
Greater tubercle of humerus
- C.
Lesser tubercle of humerus
- D.
Angle of the acromion
Correct Answer
B. Greater tubercle of humerusExplanation
The insertion of the supraspinatus muscle is the greater tubercle of the humerus. This means that the supraspinatus muscle attaches to the bony prominence on the upper part of the humerus called the greater tubercle. This insertion point allows the supraspinatus muscle to play a role in shoulder movement and stability. The other options mentioned, such as the coracoid process of the scapula, lesser tubercle of the humerus, and angle of the acromion, are not the correct insertion points for the supraspinatus muscle.Rate this question:
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- 49.
Which of the following is an action of the supraspinatus?
- A.
Adduct the shoulder
- B.
Medially rotate the shoulder
- C.
Abduct the shoulder
- D.
Elevate the scapula
Correct Answer
C. Abduct the shoulderExplanation
The supraspinatus muscle is responsible for the abduction of the shoulder. Abduction refers to the movement of the arm away from the midline of the body. This muscle is located on the upper part of the scapula and plays a key role in stabilizing and initiating the movement of the shoulder joint. When the supraspinatus muscle contracts, it helps to lift the arm out to the side, allowing for the abduction of the shoulder.Rate this question:
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- 50.
Which is the origin of the infraspinatus?
- A.
Inferior half of lateral border of scapula
- B.
Spine of the scapula
- C.
Infraspinous fossa of scapula
- D.
Medial border of scapula
Correct Answer
C. Infraspinous fossa of scapulaExplanation
The origin of the infraspinatus muscle is the infraspinous fossa of the scapula. This is the specific area on the posterior (back) side of the scapula where the muscle originates. The other options mentioned, such as the inferior half of the lateral border of the scapula, the spine of the scapula, and the medial border of the scapula, are not the correct origins for the infraspinatus muscle.Rate this question:
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Current Version
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Dec 08, 2023Quiz Edited by
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Apr 16, 2012Quiz Created by
Dawnnoelle
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