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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).
Also running along the posterior of the arm, the radial nerve provides nerve signals to the triceps brachii muscle that extends the forearm and the skin of the posterior arm. The musculocutaneous nerve innervates the flexor muscles of the arm, including the biceps brachii and brachialis muscles.he nerves of the arm and hand perform a substantial two-fold role: commanding the intricate movements of the arms all the way down to the dexterous fingers, while also receiving the vast sensory information supplied by the sensory nerves of the hands and fingers.