144 CARPO-METACARPAL ARTICULATIONS. 



The dorsal ligaments are strong fasciculi which pass from the second 

 range of carpal to the metacarpal bones. 



The palmar ligaments are thin fasciculi arranged upon the same 

 plan on the palmar surface. 



The synovial membrane is a continuation of the great synovia! 

 membrane of the two rows of carpal bones. 



The capsular ligament of the thumb is one of the three true capsular 

 ligaments of the skeleton ; the other two being the shoulder-joint and 

 hip- joint. The articulation has a proper synovial membrane. 



Fig. 68.* 



The metacarpal bones of the four fingers are firmly connected at 

 their bases by means of dorsal and palmar ligaments, which extend 

 transversely from one bone to the other, and by interosseous ligaments 

 which pass between their contiguous surfaces. Their lateral articular 



* A diagram shewing the disposition of the five synovial membranes of 

 the wrist joint. 1. The sacciform membrane. 2. The second synovial 

 membrane. 3, 3. The third, or large synovial membrane. 4. The synovial 

 membrane between the pisiform bone and the cuneiforme. 5. The synovial 

 membrane of the metacarpal articulation of the thumb. 6. The lower extre- 

 mity of the radius. 7- ITie lower extremity of the ulna. 8. The interarti- 

 cular fibro-cartilage. S. The scaphoid bone. L. The semilunare. C. The 

 cuneiforme ; the interosseous ligaments are seen passing between these 

 three bones and separating the articulation of the wrist (2) from the articula- 

 tion of the carpal bones (3). P. The pisiforme. T. The trapezium. T2. The 

 trapezoides. M. The os magnum. U. The unciforme ; interosseous liga- 

 ments are seen connecting the os magnum with the trapezoides and unci- 

 forme. 9. The base of the metacarpal bone of the thumb. 10, 10. The bases 

 of the other metacarpal bones. 



