Question 1

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

Accepted Answer

Deltoid

Question 2

A patient presents with difficulty flexing their forearm and supinating their forearm. Which muscle and nerve are most likely affected?

Accepted Answer

Biceps brachii and musculocutaneous nerve

Question 3

Which muscle originates on the lateral supracondylar ridge of the humerus and inserts on the styloid process of the radius?

Accepted Answer

Brachioradialis

Question 4

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

Accepted Answer

Teres major

Question 5

A baseball pitcher suffers a tear in the muscle that laterally rotates and extends the arm. Which muscle is most likely injured?

Accepted Answer

Teres minor

Question 6

Which muscle is responsible for pronating the forearm and is innervated by the median nerve?

Accepted Answer

Pronator quadratus

Question 7

Which muscle flexes the wrist and is innervated by the ulnar nerve?

Accepted Answer

Flexor carpi ulnaris

Question 8

A patient with carpal tunnel syndrome is most likely to experience compression of which nerve as it passes through the carpal tunnel?

Accepted Answer

Median nerve

Question 9

Which muscle originates on the medial epicondyle of the humerus and inserts on the base of the 2nd and 3rd metacarpals?

Accepted Answer

Flexor carpi radialis

Question 10

Which muscle is responsible for extending the forearm at the elbow and is innervated by the radial nerve?

Accepted Answer

Triceps brachii

Question 11

Which muscle is responsible for abducting and extending the thumb, and also abducts the wrist?

Accepted Answer

Abductor pollicis longus

Question 12

A patient is unable to extend their wrist and fingers. Which nerve is most likely damaged?

Accepted Answer

Radial nerve

Question 13

Which muscle originates on the anterior surface of the distal humerus and inserts on the coronoid process of the ulna?

Accepted Answer

Brachialis

Question 14

Which muscle is innervated by both the median and ulnar nerves and flexes the wrist and fingers?

Accepted Answer

Flexor digitorum profundus

Question 15

Which muscle is the primary abductor of the arm and is innervated by the axillary nerve?

Accepted Answer

Deltoid

Question 16

Which muscle originates on the subscapular fossa and inserts on the lesser tubercle of the humerus?

Accepted Answer

Subscapularis

Question 17

A patient is unable to flex their thumb but can flex their other fingers. Which muscle is most likely affected?

Accepted Answer

Flexor pollicis longus

Question 18

Which muscle is responsible for flexing and adducting the arm, and is innervated by the musculocutaneous nerve?

Accepted Answer

Coracobrachialis

Question 19

Which muscle originates on the lateral epicondyle of the humerus and inserts on the base of the 5th metacarpal, and what is its primary action?

Accepted Answer

Extensor carpi ulnaris; extends and adducts wrist

Question 20

Which muscle is responsible for flexing the wrist and tensing the palmar aponeurosis, and is sometimes absent in humans?

Accepted Answer

Palmaris longus

Muscles of the Upper Limb: Structure, Function, and Innervation

Study Guide - Practice Questions