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Fig. 3. —Serial axial images through forearm in 59-year-old woman with prior tumor resection and radiation therapy. Subsequent muscular atrophy allows excellent visualization of courses of nerves. BR = brachioradialis, B = brachialis, EC = extensor carpi radialis longus, P = pronator teres, h = humeral head of flexor carpi ulnaris, u = ulnar head of flexor carpi ulnaris, S = supinator, FS = flexor digitorum superficialis, FC = flexor carpi ulnaris, F = flexor digitorum profundus.

B, Deep radial nerve (wavy arrow) courses along extensor carpi radialis as it heads for supinator. Long thin arrow is superficial radial nerve. White arrow is median nerve; shaded open arrow is ulnar nerve.