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[TA] radial nerve: origin, posterior cord of brachial plexus (C6–C8, and sometimes C5 and T1); branches, posterior cutaneous and inferior lateral cutaneous nerves of arm, posterior cutaneous nerve of forearm, muscular, deep, and superficial rami; distribution, descending in the back of arm and forearm, it is ultimately distributed to skin on back of arm, forearm, and hand, extensor muscles on back of arm and forearm, and elbow joint and many joints of hand; see individual branches, in this table and under ramus; modality, general sensory and motor.Medical dictionary. 2011.