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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).
The main nerves in the hand are the radial nerve, median nerve, and ulnar nerve. The radial nerve supplies sensation to the area on the thumb side of the back of your hand. The radial nerve controls movements in the muscles on the back of your arm and forearm, which are mainly extensors. A branch of the radial nerve, the posterior interosseous nerve, controls extension movements in your wrist, fingers, and thumb.