The radial n. is formed from spinal roots C5, C6, C7, C8, T1. It innervates the following muscles: Triceps, Brachialis, Brachioradialis, Anconeus, Supinator, Extensor carpi radialis longus, Extensor carpi radialis brevis, Extenfor carpi ulnaris, Extensor digitorum communis, Extensor digiti minimi, Abductor pollicis longus, Extensor pollicis brevis, Extensor pollicis longus, and Extensor indicis.

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Intercostobrachial nerve | Radial nerve | Medial cutaneous nerve of forearm and arm |
Lateral cutaneous nerve of the forearm (Musculocutaneous Nerve) | Palmer cutaneous branch of radial nerve |
Median Nerve | Ulnar nerve | Nerve Distribution | Help | Hand Kinesiology

Lorie Richards and Janice Loudon, University of Kansas Medical Center, School of Allied Health,
Occupational and Physical Therapy Education, October 1997