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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).
Axillary nerve - innervates the deltoid muscle and shoulder, along with the posterior aspect of the upper arm. 1  Musculocutaneous nerve - innervates anterior skin of upper arm and elbow flexors. 2  Radial nerve - innervates dorsal aspect of the arm and extensors of the elbow, wrist, and fingers, abduction of thumb.