Question 1

Which structure provides the most stability to the shoulder (glenohumeral) joint?

Accepted Answer

Reinforcing muscle tendons (rotator cuff)

Question 2

A football player sustains a blow to the top and back of the shoulder, resulting in a dislocation. Which anatomical feature explains why the shoulder is prone to this injury?

Accepted Answer

The glenoid cavity is shallow and the capsule is thin and loose

Question 3

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

Accepted Answer

Deltoid (middle fibers)

Question 4

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

Accepted Answer

Teres major

Question 5

A patient presents with difficulty flexing the forearm at the elbow. Which muscle is most likely impaired?

Accepted Answer

Biceps brachii

Question 6

Which muscle acts as a synergist to the biceps brachii during forearm flexion?

Accepted Answer

Brachioradialis

Question 7

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

Accepted Answer

Triceps brachii

Question 8

Which muscle is responsible for pronating the forearm?

Accepted Answer

Pronator quadratus

Question 9

A patient is unable to extend their fingers. Which muscle is most likely affected?

Accepted Answer

Extensor digitorum

Question 10

Which muscle is the prime mover for wrist flexion and abduction?

Accepted Answer

Flexor carpi radialis

Question 11

Which muscle is responsible for thumb abduction and extension?

Accepted Answer

Abductor pollicis longus

Question 12

Which muscle acts as a synergist with the extensor carpi ulnaris to extend and abduct the wrist?

Accepted Answer

Extensor carpi radialis longus

Question 13

Which muscle is the prime mover for finger flexion at the proximal interphalangeal joints?

Accepted Answer

Flexor digitorum superficialis

Question 14

Which muscle originates on the scapula and inserts on the humerus, acting to reinforce the shoulder capsule and prevent dislocation?

Accepted Answer

Rotator cuff muscles

Question 15

Which muscle is the prime mover for forearm supination?

Accepted Answer

Supinator

Question 16

If the flexor retinaculum is damaged, which function is most likely to be impaired?

Accepted Answer

Flexion of the wrist and fingers

Question 17

Which muscle is the prime mover for wrist extension and abduction?

Accepted Answer

Extensor carpi radialis longus

Question 18

Which muscle is responsible for extending the index finger?

Accepted Answer

Extensor indicis

Question 19

A patient presents with inability to flex the wrist and adduct the hand. Which muscle is most likely affected?

Accepted Answer

Flexor carpi ulnaris

Question 20

Which equation best represents the relationship between force ($$F$$), lever arm length ($$r$$), and torque ($$	au) $$generated by a muscle acting on a joint?

Accepted Answer

$$	au = F 	imes r$$

Muscles Crossing the Shoulder, Elbow, and Forearm: Movements of the Arm, Forearm, Wrist, Hand, and Fingers

Study Guide - Practice Questions

Study Guide - Flashcards