Question 1

Which muscle is the prime mover of arm abduction at the shoulder joint?

Accepted Answer

Deltoid

Question 2

A patient presents with difficulty initiating arm abduction but can complete the movement once started. Which muscle is most likely injured?

Accepted Answer

Supraspinatus

Question 3

Which of the following muscles is NOT part of the rotator cuff?

Accepted Answer

Teres major

Question 4

During a push-up, which muscle acts as a prime mover for flexion of the arm at the shoulder?

Accepted Answer

Pectoralis major

Question 5

Which nerve innervates the latissimus dorsi muscle?

Accepted Answer

Thoracodorsal nerve

Question 6

A baseball pitcher suffers a shoulder injury and is unable to laterally rotate his arm. Which muscle is most likely affected?

Accepted Answer

Infraspinatus

Question 7

Which muscle is a synergist in arm adduction and also assists in medial rotation of the humerus?

Accepted Answer

Teres major

Question 8

Which muscle is the major flexor of the forearm at the elbow joint?

Accepted Answer

Brachialis

Question 9

A patient cannot supinate his forearm. Which muscle, if paralyzed, would most severely affect this action?

Accepted Answer

Biceps brachii

Question 10

Which muscle is the prime mover for extension of the forearm at the elbow?

Accepted Answer

Triceps brachii

Question 11

Which muscle acts as a synergist with the biceps brachii in forearm supination?

Accepted Answer

Supinator

Question 12

A patient has difficulty flexing the wrist and fingers. Which compartment of the forearm is most likely affected?

Accepted Answer

Anterior compartment

Question 13

Which muscle is responsible for initiating abduction of the arm and helps prevent downward dislocation of the humerus?

Accepted Answer

Supraspinatus

Question 14

Which muscle is the primary extensor of the arm at the shoulder joint?

Accepted Answer

Latissimus dorsi

Question 15

If the axillary nerve is damaged, which muscle's function would be most directly impaired?

Accepted Answer

Deltoid

Question 16

Which muscle is a major medial rotator of the humerus and forms part of the rotator cuff?

Accepted Answer

Subscapularis

Question 17

A patient is unable to extend his forearm at the elbow. Which nerve is most likely damaged?

Accepted Answer

Radial nerve

Question 18

Which muscle is a weak flexor of the forearm but is primarily known for its role in pronation?

Accepted Answer

Pronator teres

Question 19

Which muscle is a powerful adductor, medial rotator, and extensor of the arm, especially during actions like climbing or rowing?

Accepted Answer

Latissimus dorsi

Question 20

Which muscle is most responsible for flexion and supination of the forearm, such as when turning a doorknob?

Accepted Answer

Biceps brachii

Muscles Crossing the Shoulder and Elbow Joints: Movements of the Arm and Forearm chapter 10 part 3

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