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Fig. 3. —Photograph of dissection in specimen 4 shows proximally (curved arrow) that extensor pollicis longus (EPL) crosses over extensor carpi radialis tendons. More distally (small black arrows), EPL reaches base of metacarpal head where it joins extensor pollicis brevis tendon (arrowheads) and is covered by dorsal reinforcements (r). EPL tendon (large black arrow) continues distally.