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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).
â¢ Branches of the radial nerve provide elbow extension, occasional elbow flexion (variably through the brachioradialis muscle as well as a branch to the brachialis muscle), supination of the forearm (although the biceps muscle innervated by musculocutaneous nerve is the major supinator) and wrist/finger/thumb extension. Branches of the radial nerve provide elbow extension, occasional elbow flexion (variably through the brachioradialis muscle as well as a branch to the brachialis muscle), supination of the forearm (although the biceps muscle innervated by musculocutaneous nerve is the major supinator) and wrist/finger/thumb extension.