Posterior interosseous nerve

The posterior interosseous nerve (or dorsal interosseous nerve) is a nerve in the forearm. It is the continuation of the deep branch of the radial nerve, after this has crossed the supinator muscle. It is considerably diminished in size compared to the deep branch of the radial nerve. The nerve fibers originate from cervical segments C7 and C8.

Posterior interosseous nerve
The supinator. (Deep branch of radial nerve labeled at upper right and lower right. Dorsal interosseous is this nerve after passing the supinator, at lower right.)
Details
FromDeep branch of the radial nerve
Innervates
Identifiers
Latinnervus interosseus antebrachii posterior
TAA14.2.03.055
FMA77559
Anatomical terms of neuroanatomy

Structure

Course

It descends along the interosseous membrane, anterior to the extensor pollicis longus muscle, to the back of the carpus, where it presents a gangliform enlargement from which filaments are distributed to the ligaments and articulations of the carpus.

Supply

It supplies all the muscles on the radial side and dorsal surface of the forearm, except the anconaeus, brachioradialis, extensor carpi radialis longus. In other words, it supplies the following muscles:

Clinical significance

The posterior interosseous nerve may be entrapped at the arcade of Frohse, which is part of the supinator muscle. Posterior interosseous neuropathy is purely a motor syndrome resulting in finger drop due to no extension of IP joints and radial wrist deviation on extension.

See also

References

This article incorporates text in the public domain from page 944 of the 20th edition of Gray's Anatomy (1918) .


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