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.
| Posterior cutaneous nerve of arm | |
|---|---|
 Cutaneous nerves of right upper extremity. ("Post. brach. cutan." visible at center left.) | |
| Details | |
| From | Radial nerve |
| Identifiers | |
| Latin | nervus cutaneus brachii posterior |
| TA98 | A14.2.03.050 |
| TA2 | 6432 |
| FMA | 44948 |
| Anatomical terms of neuroanatomy | |
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.
See also
Additional images
Cross-section through the middle of upper arm.
Diagram of segmental distribution of the cutaneous nerves of the right upper extremity.
References
This article incorporates text in the public domain from page 943 of the 20th edition of Gray's Anatomy (1918)
