Posterior Cutaneous Nerve of Arm

The posterior cutaneous nerve of arm (internal cutaneous branch of musculospiral, posterior brachial cutaneous nerve) is a branch of the radial nerve that provides sensory innervation for much of the skin on the back of the arm. It arises in the axilla.

It is of small size, and passes through the axilla to the medial side of the area supplying the skin on its dorsal surface nearly as far as the olecranon.

In its course it crosses behind and communicates with the intercostobrachial.

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Posterior Cutaneous Nerve Of Arm - Additional Images
... Cross-section through the middle of upper arm Diagram of segmental distribution of the cutaneous nerves of the right upper extremity ...

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