Question 1

Which muscle is primarily responsible for the initial 15 degrees of arm abduction at the shoulder joint?

Accepted Answer

Supraspinatus

Question 2

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

Accepted Answer

Supraspinatus

Question 3

Which muscle acts as the primary flexor of the forearm at the elbow joint?

Accepted Answer

Brachialis

Question 4

During a tennis serve, which rotator cuff muscle is most responsible for lateral rotation of the humerus?

Accepted Answer

Infraspinatus

Question 5

Which muscle is NOT part of the rotator cuff?

Accepted Answer

Deltoid

Question 6

A baseball pitcher suffers a tear in the muscle that medially rotates the humerus. Which muscle is most likely affected?

Accepted Answer

Subscapularis

Question 7

Which muscle is the main extensor of the forearm at the elbow joint?

Accepted Answer

Triceps brachii

Question 8

Which muscle is responsible for supination of the forearm, especially when the elbow is flexed?

Accepted Answer

Biceps brachii

Question 9

A patient cannot extend their wrist and fingers after a humeral fracture. Which muscle group is most likely affected?

Accepted Answer

Posterior forearm muscles

Question 10

Which muscle is a powerful flexor of the wrist and is located on the lateral side of the anterior forearm?

Accepted Answer

Flexor carpi radialis

Question 11

Which muscle is responsible for pronation of the forearm?

Accepted Answer

Pronator teres

Question 12

A patient is unable to abduct their arm beyond 15 degrees but can initiate the movement. Which muscle is most likely impaired?

Accepted Answer

Deltoid

Question 13

Which muscle assists the triceps brachii in forearm extension and is located near the elbow?

Accepted Answer

Anconeus

Question 14

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

Accepted Answer

Pectoralis major

Question 15

Which muscle is most responsible for flexion of the fingers at the metacarpophalangeal joints?

Accepted Answer

Flexor digitorum superficialis

Question 16

Which muscle is located in the posterior compartment of the forearm and extends the wrist?

Accepted Answer

Extensor carpi ulnaris

Question 17

A patient presents with weakness in supination of the forearm. Which muscle, if paralyzed, would most severely affect this movement when the elbow is flexed?

Accepted Answer

Biceps brachii

Question 18

Which muscle originates from the medial epicondyle of the humerus and flexes the wrist?

Accepted Answer

Flexor carpi radialis

Question 19

Which muscle is responsible for extension of the fingers at the interphalangeal joints?

Accepted Answer

Extensor digitorum

Question 20

Which muscle is a deep muscle of the forearm that assists in supination and is located near the proximal radius?

Accepted Answer

Supinator

Muscles Crossing the Shoulder and Elbow Joints: Movements of the Arm and Forearm

Study Guide - Practice Questions

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