12 THE POCKET ANATOMY 



The synovial membrane (membrana sacciformis) is very loose, 

 and lines the contiguous surfaces of the radius and ulna, 

 together with the upper surface of the triangular cartilage ; 

 sometimes communicates with the synovial sac of wrist-joint. 



,' ' 



VII. THE WRIST-JOINT. 



The wrist-joint is a condyloid joint, formed by the lower 

 end of the radius and the triangular fibro-cartilage above ; 

 and by the scaphoid, semilunar and cuneiform bones below. 

 It is united by the following ligaments : 



The external lateral ligament passes from the tip of the 

 styloid process of the radius to a depression on the outer 

 surface of the scaphoid bone. 



The internal lateral ligament, a fibrous cord, passes from 

 the end of the styloid process of the ulna, and dividing into 

 two, one part is attached to the pisiform bone, and the other 

 to the inner side of the cuneiform bone. 



The anterior ligament, broad and membranous, consists of 

 three bundles of fibres, springing from the anterior edge of 

 the lower end of radius, and the styloid process of the ulna ; 

 below it is fixed into the anterior surfaces of the scaphoid, 

 semilunar and cuneiform bones, some fibres being continued 

 to the os magnum. 



The posterior ligament, weaker than the preceding, springs 

 from the posterior margin of the lower end of the radius, and 

 is attached to the dorsal surfaces of the scaphoid, semilunar, 

 and cuneiform bones. 



A synovial membrane lines the joint. 



VIII. ARTICULATIONS OF THE CARPUS. 



Articulations of the ist Row of Carpal Bones, the pisiform 

 excepted (arthrodial) . 



The dorsal ligaments pass transversely between the scaphoid 

 and semilunar, the semilunar and the cuneiform. 



The palmar ligaments connect the bones similarly upon the 

 anterior surface. 



The interosseous ligaments (2) close the upper part of the 

 intervals between the scaphoid and semilunar, the semilunar 

 and cuneiform bones. 



Articulations of the 2nd Row of Carpal Bones (arthrodial). 



The dorsal ligaments (3) pass transversely from bone to 

 hone as in the ist row. 



The palmar ligaments (3), similar to those of the ist row 



