Figure 10-5. Horizontal section through the lower ends of the radius and ulna. Three synovial sheaths are shown anteriorly, but the six sheaths on the posterior aspect (see fig. 11-3) are not included. The radial artery and the styloid process of the ulna indicate the boundaries between the flexor and extensor muscles. The median nerve is overlapped by the palmaris longus (when present) and is at the lateral edge of the flexor superficialis. The radial artery lies lateral to the flexor carpi radialis. Note the relationship of the extensor pollicis longus to the dorsal tubercle of the radius (*). (Modified from Castaing & Soutoul.) Click for high resolution image.

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