Forearm Extensor Muscles

Anatomy · Upper limb anatomy

Muscle	Innervation
Brachioradialis	Radial Nerve
Extensor Carpi Radialis Longus	Radial Nerve
Extensor Carpi Radialis Brevis	Radial Nerve (deep branch)
Extensor digitorum	Radial Nerve (posterior interosseous nerve)
Extensor Carpi Ulnaris	Radial Nerve (posterior interosseous nerve)
Supinator	Radial Nerve (deep branch)
Abductor Pollicis Longus	Radial Nerve (posterior interosseous nerve)
Extensor Pollicis Longus	Radial Nerve (posterior interosseous nerve)
Extensor Pollicis Brevis	Radial Nerve (posterior interosseous nerve)
Extensor Indicis	Radial Nerve (posterior interosseous nerve)

The radial nerve divides into deep and superficial branches in the proximal forearm near the radial head. The deep branch becomes the posterior interosseous nerve after passing through the supinator. The superficial branch continues to the hand and doesnt give motor branches in the forearm.

Prior to dividing the radial nerve innervates Brachioradialis and ECRL directly. All other muscles are innervated by the deep branch or its continuation the posterior interosseous nerve.


Wikipedia