The portion of the radius closest to the wrist is the distal extremity. It is quite large and has a rectangular shape. At the joint, the radius has two articular surfaces -- areas that act as points of movement for the wrist. The carpal articular surface has a smooth, triangular, concave shape. This section works with the carpal bones of the hand. The ulnar notch is narrow and, like the carpal region, concave and smooth. This region provides movement at the head of the ulna.
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