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Extrinsic muscles of the hand innervated by the radial nerve. extensor digitorum communis (EDC), extensor digiti minimi (EDM), extensor indicis, extensor pollicis longus (EPL), extensor pollicis brevis (EPB), abductor pollicis longus (APL).
Course and Muscular Innervation. The radial nerve is the nerve of the posterior arm. This is the case for both the upper arm (three heads of the triceps) as well as the forearm (wrist and finger extensors). The nerve originates from the posterior cord of the brachial plexus (from the ventral rami of C5-T1).