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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 distinction of these extensor muscles (forearm elevators) as to superficial (1-6) and deep (7-11) is much less precise than it was in the flexor compartment. Some consider there to be a single extensor compartment with digital and thumb muscles. Identify brachioradialis and the superficial group of extensors. 2  Lift the brachioradialis to expose the radial nerve splitting into deep and superficial branches. 3  Verify that the radial nerve innervates all the muscles of the extensor group of the forearm.