124 HUMAN ANATOMY. 



THE RADIO-CARPAL, or wrist-joint, is a condyloid joint con- 

 sisting of an elliptical cavity formed by the radius and triangular 

 cartilage,, into which fits the convex surfaces of the scaphoid, 

 semi-lunar, and cuneiform below. Its ligaments are external 

 and internal lateral, anterior and posterior radio-carpal. 



External lateral passes from the styloid process of radius to 

 the scaphoid, os magnum, and trapezium. 



Internal lateral passes from the styloid process of ulna to 

 the cuneiform, pisiform, and annular ligament. 



The anterior radio-carpal is a' broad membrane attached 

 above to the anterior margin of the radius, its styloid process and 

 ulna, and below to cuneiform, semi-lunar, scaphoid, and os mag- 

 num, strengthened by a band extending from styloid process of 

 ulna to semi-lunar and cuneiform. 



The posterior radio-carpal is attached to dorsal margin of 

 radius, and below to cuneiform, semi-lunar, and scaphoid. The 

 anterior and posterior radio-carpal belong to the annular liga- 

 ment (vide fascias). 



Its arteries are the anterior and posterior carpal, derived 

 from the radial and ulnar, anterior and posterior interosseous, 

 and ascending branches from the deep palmar arch. 



Its nerves are derived from the median, ulnar, and posterior 

 interosseous. 



The carpal articulations are arthrodial, and consist of three 

 sets. The first row is held together by two palmar, two dorsal, 

 and two interosseous; the second row by three dorsal, three 

 palmar, and three interosseous; and the two rows are held to- 

 gether by a palmar, dorsal, internal and external lateral ligament. 



FIRST Bow. The palmar and dorsal ligaments connect the 

 scaphoid and semi-lunar, and semi-lunar and cuneiform together 

 on the front and back. 



The interosseous connect the semi-lunar with the scaphoid 

 and cuneiform. 



The pisiform bone has a separate capsular ligament and 

 an interosseous ligament connecting it to the fifth metacarpal 

 bone and cuneiform. 



SECOND Eow. The palmar and dorsal ligaments connect 

 the trapezium with the trapezoid, and the os magnum with the 

 trapezoid and unciform, on the front and back of the wrist. 



The interosseous connect the adjacent surfaces of the trape- 

 zium and trapezoid, and the os magnum with the trapezoid and 

 unciform. 



Two Rows TOGETHER. The palmar and dorsal connect 

 the bones of the first with the second rows on the front and back 



