DISSECTING MANUAL. 



ticulum (recessus sacriformis) upward between the radius and 

 ulna. [282] 



Accessory Ligaments. The interosseous membrane is a strong 

 layer connecting the interosseous borders of the radius and 

 ulna; its fibres run chiefly downward and outward. It begins 

 about an inch below the bicipital tuberosity, leaving a gap 

 (hiatus interosseous) above its upper border, and extends 

 downward to the inferior radio-ulnar joint. The oblique liga- 

 ment is a slender band running from the outer part of the coro- 

 noid process, downward and outward to the radius just below 

 the bicipital tuberosity. [283] 



Radio-carpal Joint. This is a bi-axial diarthrosis, or con- 

 dyloid joint, between the radius and triangular fibro-cartilage, 

 and the scaphoid, semilunar, and cuneiform bones. It has a 

 complete capsule, lined by a synovial membrane, and divisible 

 into the four following proper ligaments, viz.: The external 

 lateral is a band running from the tip of the radial styloid 

 process to a rough area at the base of the tubercle of the sca- 

 phoid. The internal lateral is a rounded band running from 

 the tip of the ulnar styloid process to the rough non-articular 

 border of the cuneiform, some fibres being prolonged to the 

 pisiform. The anterior is a layer attached to the anterior bor- 

 der of the lower end of the radius and (slightly) base of the 

 ulnar styloid process, adhering to the triangular fibro-cartilage. 

 Some fibres are transverse ; most run obliquely downward and 

 inward to the palmar surfaces of the scaphoid, semilunar, 

 cuneiform, and (sometimes) os magnum; fibres from the ulna 

 run obliquely outward. The posterior is a layer running from 

 the posterior border of the lower end of the radius, obliquely 

 downward to the dorsal surfaces of the proximal carpal row, 

 especially the cuneiform. [283] 



Carpal Joints. These are gliding (arthrodial) diarthroses. 

 Joints of proximal row: The scaphoid, semilunar, and cunei- 

 form are united by short and strong transverse ligaments, viz. : 

 two (anterior, or palmar) between their palmar surfaces; two 



[154] 



