Question 1

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

Accepted Answer

Triceps brachii

Question 2

If a patient cannot flex their forearm at the elbow, which muscle is most likely injured?

Accepted Answer

Brachialis

Question 3

Which of the following muscles is located in the posterior compartment of the forearm and is responsible for extension of the wrist?

Accepted Answer

Extensor carpi radialis longus

Question 4

A baseball pitcher suffers an injury to the medial epicondyle of the humerus. Which group of muscles is most likely affected?

Accepted Answer

Anterior forearm muscles

Question 5

Which muscle is deep and medial to the biceps brachii and assists in flexion of the elbow?

Accepted Answer

Brachialis

Question 6

During a push-up, which muscle acts as the main flexor of the forearm?

Accepted Answer

Biceps brachii

Question 7

Which muscle is responsible for pronation of the forearm?

Accepted Answer

Pronator teres

Question 8

A patient presents with inability to extend their fingers. Which muscle is most likely compromised?

Accepted Answer

Extensor digitorum

Question 9

Which muscle originates from the coracoid process of the scapula and inserts on the medial surface of the humerus?

Accepted Answer

Coracobrachialis

Question 10

Which muscle is found in the superficial layer of the anterior forearm and is responsible for flexion of the wrist?

Accepted Answer

Flexor carpi radialis

Question 11

Which muscle is NOT part of the posterior forearm compartment?

Accepted Answer

Flexor digitorum profundus

Question 12

If the lateral head of the triceps brachii is damaged, which movement would be most affected?

Accepted Answer

Extension of the elbow

Question 13

Which muscle is responsible for abduction and extension of the thumb?

Accepted Answer

Abductor pollicis longus

Question 14

Which muscle is most superficial in the anterior compartment of the arm?

Accepted Answer

Biceps brachii

Question 15

Which muscle is involved in both flexion and pronation of the forearm?

Accepted Answer

Pronator teres

Question 16

A patient has difficulty abducting their wrist. Which muscle is most likely affected?

Accepted Answer

Extensor carpi radialis longus

Question 17

Which muscle inserts into the olecranon process of the ulna?

Accepted Answer

Triceps brachii

Question 18

Which muscle is responsible for flexion of the distal phalanges of the fingers?

Accepted Answer

Flexor digitorum profundus

Question 19

Which muscle is located in the deep layer of the anterior forearm and is responsible for pronation?

Accepted Answer

Pronator quadratus

Question 20

Which equation best represents the relationship between muscle force ($$F$$), cross-sectional area ($$A$$), and muscle stress ($$\sigma$$)?

Accepted Answer

$$\sigma = F / A$$

Gross Anatomy of the Muscular System: Muscles of the Upper Limb

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