THE CARPAL JOINT

This exceptionally moveable joint (Figure 36-1) permits almost 180° of flexion. The accessory carpal bone reveals the locations of the two more proximal compart­ments of the joint; these are in communication with each other and thus allow a single injection to reach both. Entry is made to either side of the extensor carpi radialis tendon, which is readily identified.

No features of the limb arteries demand notice. Lymph originating from superficial structures of the arm and forearm passes to the ventral superficial cervi­cal nodes. That from deeper structures and from the entire distal part of the limb goes to the axillary lymph nodes of the first rib (cranial to the first rib and ventral to the axillary vessels).