Synovial Membranes
The synovial membrane is a continuation of that of the intercarpal joints. Occasionally, the joint between the hamate and the fourth and fifth metacarpal bones has a separate synovial membrane.
The synovial membranes of the wrist and carpus are thus seen to be five in number.
- The first passes from the lower end of the ulnar to the ulnar notch of the radius, and lines the upper surface of the articular disk.
- The second passes from the articular disk and the lower end of the radius above, to the bones of the first row below.
- The third, the most extensive, passes between the contiguous margins of the two rows of carpal bones, and sometimes, in the event of one of the interosseous ligaments being absent, between the bones of the second row to the carpal extremities of the second, third, fourth, and fifth metacarpal bones.
- The fourth extends from the margin of the greater multangular to the metacarpal bone of the thumb.
- The fifth runs between the adjacent margins of the triangular and pisiform bones.
Occasionally the fourth and fifth carpometacarpal joints have a separate synovial membrane.
Read more about this topic: Carpometacarpal Joint
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