Upper Limb Anatomy: Muscles and Nerves

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Questions and Answers

A patient presents with the inability to flex the distal interphalangeal joint of their index finger, but can still flex the proximal interphalangeal joint. Which muscle tendon is most likely affected?

Flexor digitorum profundus (correct)
Palmaris longus
Flexor digitorum superficialis
Flexor pollicis longus

Wrist extension is not required for stabilizing the wrist when flexing the fingers.

False (B)

Which nerve primarily innervates the extensor muscles of the posterior forearm?

radial nerve

The best way to visualize the brachioradialis is to partially ______ the forearm and then flex the elbow against resistance.

pronate Signup and view all the answers

Match the following muscles to their primary action on the wrist:

Flexor carpi ulnaris = Wrist flexion and ulnar deviation Extensor carpi radialis longus = Wrist extension and radial deviation Flexor carpi radialis = Wrist flexion and radial deviation Extensor carpi ulnaris = Wrist extension and ulnar deviation Signup and view all the answers

Which of the following muscle actions would be most affected by damage to the medial epicondyle of the humerus?

Wrist flexion (D) Signup and view all the answers

The palmaris longus muscle is located on the ulnar side of the anterior forearm.

False (B) Signup and view all the answers

Which muscle is responsible for pronation of the forearm and crosses directly across the radius?

pronator teres Signup and view all the answers

The tendons of the flexor digitorum superficialis split before attaching to the ______ phalanges.

middle Signup and view all the answers

Which of the following muscles contributes to both wrist flexion and radial deviation?

Flexor carpi radialis (A) Signup and view all the answers

Flashcards

Anterior Forearm Muscles

Muscles primarily responsible for flexing the digits or wrist, located on the anterior side of the forearm.

Flexor Carpi Radialis

Runs along the radial side to the carpal bones and flexes the wrist.

Pronator Teres

A short muscle running across the radius, causing pronation of the forearm.

Flexor Digitorum Profundus

Located deeper in the forearm; its tendons run to the tips of the fingers, allowing flexion at the distal interphalangeal joint.