Posterior interosseous nerve

Tags: Anatomical Structure, 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.

thumbnail

branch from

Deep branch of radial nerve

Dorlands prefix

n_05

Dorlands suffix

12565987

Gray page

944

Gray subject

210

innervates

Abductor pollicis longus muscle, Extensor digitorum muscle, Extensor pollicis brevis muscle, Extensor pollicis longus muscle, Supinator muscle, Extensor carpi radialis brevis muscle, Extensor carpi ulnaris muscle, Extensor indicis muscle, Extensor digiti minimi muscle