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Posterior Brachial Cutaneous Nerve
Nervous System

Posterior Brachial Cutaneous Nerve

Nervus cutaneus posterior brachii

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The posterior brachial cutaneous nerve is a branch of the radial nerve.


In the upper part of the arm, the radial nerve descends posterolaterally through the lower triangular space to enter the radial groove along with the profunda brachii vessels. Before entering the spiral groove in the midarm, it gives off the posterior brachial cutaneous nerve (which innervates a strip of skin overlying the triceps muscle).


There are no named branches.

Supplied Structures

The posterior brachial cutaneous nerve provides cutaneous innervation to the skin of the back of the arm, from the insertion of the deltoid to the olecranon process of ulna.

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Cutaneous Nerve

ScienceDirect image

The medial antebrachial cutaneous nerve is a pure sensory nerve that originates from the medial cord of the brachial plexus and innervates the skin of the medial forearm.

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