Medial cutaneous nerve of forearm

Medial cutaneous nerve of forearm
	Diagram of segmental distribution of the cutaneous nerves of the right upper extremity. Posterior view. ("Medial antebrach. cutan." visible in green.)
Details
From	Medial cord
Identifiers
Latin	Nervus cutaneus antebrachii medialis
TA	A14.2.03.028
FMA	39079
	Anatomical terms of neuroanatomy

The medial cutaneous nerve of the forearm (medial antebrachial cutaneous nerve) branches from the medial cord of the brachial plexus. It contains axons from the ventral rami of the eighth cervical (C8) and first thoracic (T1) nerves.

It gives off a branch near the axilla, which pierces the fascia and supplies the skin covering the biceps brachii, nearly as far as the elbow.

The nerve then runs down the ulnar side of the arm medial to the brachial artery, pierces the deep fascia with the basilic vein, about the middle of the arm, and divides into a volar and an ulnar branch.

Volar branch

The volar branch (ramus volaris; anterior branch), the larger, passes usually in front of, but occasionally behind, the vena mediana cubiti (median basilic vein).

It then descends on the front of the ulnar side of the forearm, distributing filaments to the skin as far as the wrist, and communicating with the palmar cutaneous branch of the ulnar nerve.

Medial antebrachial nerve

Ulnar branch

The ulnar branch (ramus ulnaris; posterior branch) passes obliquely downward on the medial side of the basilic vein, in front of the medial epicondyle of the humerus, to the back of the forearm, and descends on its ulnar side as far as the wrist, distributing filaments to the skin.

It communicates with the medial brachial cutaneous, the dorsal antebrachial cutaneous branch of the radial, and the dorsal branch of the ulnar.

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Additional images

Brachial plexus with courses of spinal nerves shown
Cutaneous nerves of right upper extremity.
Medial antebrachial cutaneous nerve
antebrachial cutaneous nerve

References

This article incorporates text in the public domain from page 937 of the 20th edition of Gray's Anatomy (1918)

External links

lesson2superficveinsupperlimb at The Anatomy Lesson by Wesley Norman (Georgetown University), lesson5nervesofpostforearm at The Anatomy Lesson by Wesley Norman (Georgetown University)
Medial_antebrachial_cutaneous_nerve at the Duke University Health System's Orthopedics program
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Anatomy figure: 06:03-06 at Human Anatomy Online, SUNY Downstate Medical Center - "Cutaneous nerves of the upper extremity."
Hand kinesiology at the University of Kansas Medical Center

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