Medial cutaneous nerve of forearm

Nerve: Medial cutaneous nerve of forearm
Diagram of segmental distribution of the cutaneous nerves of the right upper extremity. Posterior view. ("Medial antibrach. cutan." visible in green.)
Latin	n. cutaneus antibrachii medialis
Gray's	subject #210 937
From	medial cord

The Medial Antebrachial Cutaneous Nerve (internal cutaneous nerve, medial cutaneous nerve of forearm) arises from the medial cord of the brachial plexus.

It derives its fibers from the eighth cervical and first thoracic nerves, and at its commencement is placed medial to the axillary artery.

It gives off, near the axilla, a filament, which pierces the fascia and supplies the integument 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 antibrachial cutaneous branch of the radial, and the dorsal branch of the ulnar.

See also

• Dorsal antebrachial cutaneous nerve
• Lateral antebrachial cutaneous nerve
• Medial brachial cutaneous nerve

Additional images

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  Brachial plexus

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  Brachial plexus with courses of spinal nerves shown

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  Cross-section through the middle of upper arm.

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  Cross-section through the middle of the forearm.

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  The brachial artery.

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  Cutaneous nerves of right upper extremity.

External links

• lesson2superficveinsupperlimb at The Anatomy Lesson by Wesley Norman (Georgetown University), lesson5nervesofpostforearm at The Anatomy Lesson by Wesley Norman (Georgetown University)
• Duke Orthopedics medial_antebrachial_cutaneous_nerve
• EatonHand ner-067
• SUNY Figs 06:03-06 - "Cutaneous nerves of the upper extremity."
• medial+cutaneous+nerve+of+forearm at eMedicine Dictionary
• Hand kinesiology at UK nerves/medialcutan.htm

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained within it may be outdated.