Lab 4 - Module 1 - Extensor Compartments of the Arm and Forearm: Page 7 of 9
Nerves of the Posterior Forearm
| The nerves of the posterior forearm are small and are not deliniated on this 3D cadaver. |
| Deep Branch of the radial nerve supplies the extensor carpi radialis brevis and the supinator muscles. When the deep branch of the radial nerve emerges from the supinator muscle and enters the posterior compartment of the forearm it is called the posterior interosseous nerve. It lies on the interosseous membrane where it is accompanied by the posterior interosseous artery. The posterior interosseous nerve supplies the extensor digitorum, extensor digiti minimi, extensor carpi ulnaris, extensor indicies and the three thumb muscles. |
| Superficial Branch – continuation of the radial nerve. It passes deep to the brachioradialis muscle then at the wrist divides into four or five digital nerves. The distribution of the superficial branch of the radial nerve is cutaneous and articular. It supplies the lateral two-thirds of the dorsal surface of the hand and the dorsal surface of the lateral 2-3 ½ proximal phalanges. |
