142 



CARPAL ARTICULATIONS. 



Fig. 67." 



phoid bone. The radial artery rests on this ligament as it passes back- 

 wards to the first metacarpal space. 



The synovial membrane of the wrist joint lines the under surface of 

 the radius and interarticular cartilage above, and the first row of bones 

 of the carpus below. 



The relations of the wrist 

 joint are the flexor and exten- 

 sor tendons by which it is sur- 

 rounded, and the radial and ul- 

 nar artery. 



Actions. The movements of 

 the wrist joint are Jkorion* ex- 

 tension, adduction^abdiiction., and 

 circumduction. In these mo- 

 tions the articular surfaces glide 

 upon each other. 



8. Articulations between the 

 Carpal Bones. These are am- 

 phi-arthrodial joints, with the 

 exception of the conjoined head 

 of the os magnum and unci- 

 fonne, which is received into a 

 cup formed by the scaphoid, 

 semilunar, and cuneiform bone, 

 and constitutes an enarthrosis. 

 The ligaments are, 



Dorsal, 

 Palmar, 



Interosseous fibro-cartilage, 

 Anterior annular. 

 The dorsal ligaments are 

 ligamentous bands, that pass 



* The ligaments of the anterior aspect of the wrist and hand. 1. The lower 

 part of the interosseous membrane. 2. The anterior inferior radio-ulnar liga- 

 ment. 3. The anterior ligament of the wrist joint. 4. Its external lateral 

 ligament. 5. Its internal lateral ligament. 6. The palmar ligaments of the 

 carpus. 7. The pisiform bone, with its ligaments. 8. The ligaments con- 

 necting the second range of carpal bones with the metacarpal, and the meta- 

 carpal with each other. 9. The capsular ligament of the carpo-metacarpal ar- 

 ticulation of the thumb. 10. Anterior ligament of the metacarpo-phalangeal 

 articulation of the thumb. 1 1 . One of the lateral ligaments of that articu- 

 lation. 12. Anterior ligament of the metacarpo-phalangeal articulation of 

 the index finger; this ligament has been removed in the other fingers. 

 13. Lateral ligaments of the same articulation; the corresponding ligaments 

 are seen in the other articulations. 14. Transverse ligament connecting the 

 heads of the metacarpal bones of the index and middle fingers ; the same liga- 

 ment is seen between the other fingers. 15 Anterior and one lateral liga- 

 ment of the phalangeal articulation of the thumb. 16. Anterior and lateral 

 ligaments of the phalangeal articulations of the index finger ; the anterior 

 ligaments are removed in the other fingers. 



