Question 1

Which muscle is primarily responsible for flexion of the distal interphalangeal joints of the medial four fingers?

Accepted Answer

Flexor digitorum profundus

Question 2

A patient presents with difficulty flexing the interphalangeal joint of the thumb and the distal interphalangeal joint of the index finger. Which nerve is most likely injured?

Accepted Answer

Median nerve

Question 3

During pronation of the forearm, which anatomical structure allows the radius to cross over the ulna?

Accepted Answer

The distal radio-ulnar joint

Question 4

Which muscle is absent in approximately 15% of the population and is involved in wrist flexion and tensing the palmar aponeurosis?

Accepted Answer

Palmaris longus

Question 5

A laceration to the anterior compartment of the forearm near the wrist would most likely damage which artery?

Accepted Answer

Ulnar artery

Question 6

Which muscle originates from the medial epicondyle of the humerus and the coronoid process of the ulna, and inserts onto the lateral surface of the radius?

Accepted Answer

Pronator teres

Question 7

Which nerve innervates all muscles in the posterior compartment of the forearm?

Accepted Answer

Radial nerve

Question 8

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

Accepted Answer

Extensor muscles of the forearm

Question 9

Which muscle acts as an accessory flexor of the elbow joint, despite being located in the posterior compartment of the forearm?

Accepted Answer

Brachioradialis

Question 10

Which artery passes deep to the pronator teres muscle and supplies the anterior compartment of the forearm?

Accepted Answer

Ulnar artery

Question 11

Which structure connects the medial and lateral borders of the radius and ulna, providing attachment for deep forearm muscles and transmitting forces from the hand to the humerus?

Accepted Answer

Interosseous membrane

Question 12

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

Accepted Answer

Pronator quadratus

Question 13

A patient presents with impaired flexion of the interphalangeal joint of the thumb and the distal interphalangeal joint of the index finger. Which branch of the median nerve is most likely affected?

Accepted Answer

Anterior interosseous nerve

Question 14

Which muscle originates from the lateral epicondyle of the humerus and inserts onto the dorsal surface of the base of the 5th metacarpal, extending and adducting the wrist?

Accepted Answer

Extensor carpi ulnaris

Question 15

Which muscle is the major extensor of the four fingers and originates from the lateral epicondyle of the humerus?

Accepted Answer

Extensor digitorum

Question 16

Which muscle is responsible for supination of the forearm and is innervated by the posterior interosseous nerve?

Accepted Answer

Supinator

Question 17

Which artery is a branch of the ulnar artery and divides into anterior and posterior interosseous arteries?

Accepted Answer

Common interosseous artery

Question 18

Which muscle originates from the anterior surface of the radius and adjacent interosseous membrane, and inserts onto the base of the distal phalanx of the thumb?

Accepted Answer

Flexor pollicis longus

Question 19

Which nerve passes through the cubital fossa and supplies most muscles in the anterior compartment of the forearm?

Accepted Answer

Median nerve

Question 20

A patient suffers a deep laceration to the posterior compartment of the forearm, resulting in inability to extend the thumb. Which muscle is most likely affected?

Accepted Answer

Extensor pollicis longus

Anatomy and Physiology of the Forearm: Bones, Muscles, Vessels, and Nerves

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