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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.

D, Anterior interosseous nerve (arrowhead) dives toward interosseous membrane. Ulnar nerve (shaded open arrow) is located between flexor carpi ulnaris and flexor digitorum profundus. White arrow is median nerve, long thin arrow is superficial radial nerve, and wavy arrow is deep radial nerve.