Right forearm and hand. A. The brachioradialis tendon divides into two parts, with the superficial branch of the radial nerve emerging between these two slips (point A) and becoming subcutaneous at this location. B. The superficial branch of the radial nerve bifurcates into two branches proximal to the extensor retinaculum at point B. CV: cephalic vein; ECRL: extensor carpi radialis longus; BRT: brachioradialis tendon; BRM: brachioradialis muscle; ER: extensor retinaculum; APLM: abductor pollicis longus muscle; EPBM: extensor pollicis brevis muscle.