Forearm Neuroanatomy: Median Nerve and Branches

Vocabulary flashcards covering the anatomical origin, path, and specific muscular and cutaneous branches of the median nerve and anterior interosseous nerve as described in the lecture notes.

S 9 taneous nerve of the forearm

Supplies the skin of the front and lateral aspects of the forearm down as far as the root of the thumb.

Articular branches (first mention)

Supply the bow joint.

Median nerve origin

Originates from the medial and lateral cords of the brachial plexus ($C5$ to $TV$) in the axilla.

Median nerve path (Arm)

First runs on the lateral side of the brachial artery, then crosses halfway down to continue on its medial side.

Median nerve arm branches

Has no branches in the arm, except for a small vasomotor nerve to the brachial artery.

Median nerve (Cubital fossa position)

Lies deep to the bicipital aponeurosis.

Median nerve (Exit from cubital fossa)

Leaves by passing between the two heads of the pronator teres muscle.

Median nerve (Forearm path)

Continues downward sandwiched between the flexor digitorum superficialis and flexor digitorum profundus muscles.

Median nerve (Wrist position)

Emerges from the lateral border of the flexor digitorum superficialis and lies behind the tendon of the palmaris longus.

Major motor nerve of the anterior compartment of the forearm

The median nerve, which supplies all muscles except the flexor carpi ulnaris and the medial half of the flexor digitorum profundus.

Median nerve muscular branches (Cubital fossa)

Supplies the pronator teres, the flexor carpi radialis, the palmaris longus, and the flexor digitorum superficialis.

Articular branches (Forearm)

Supply the elbow joint.

Palmar cutaneous branch

Arises in the lower part of the forearm, crosses the superficial side of the flexor retinaculum, and distributes to the skin over the lateral part of the palm.

Anterior interosseous nerve origin

Arises from the median nerve as it emerges from between the two heads of the pronator teres muscle.

Anterior interosseous nerve path

Passes downward on the anterior surface of the interosseous membrane between the flexor pollicis longus and the flexor digitorum profundus.

Anterior interosseous nerve termination

Ends on the anterior surface of the carpus.