192 



CARPUS. 



Fig- 43.* of this cavity is another smooth, 



but narrow, oblong sinuosity, for 

 receiving the upper end of the 

 unciforme : and on the inside of this 

 a small convexity is found, for its 

 connexion with the os cuneiforme. 

 Between the great convexity above, 

 and the first deep infeiior cavity, 

 there is a rough fossa, in which the 

 *sv!*i circular ligament of the ioint of the 

 *^_j \ wrist is fixed. 



Os cuneiforme is broader above 

 and towards the back of the hand, 

 than it is below and forwards ; which gives it the resem- 

 blance of a wedge. The superior slightly convex surface ic 

 included in the joint of the wrist, being opposed to the lower 

 end of the ulna. Below this the cuneiforme bone has a rough 

 fossa, wherein the ligament of the articulation of the wrist is 

 fixed. On the external side of this bone, where it is contiguous 

 to the os lunare, it is smooth, and slightly concave. Its lower 

 surface, where it is contiguous to the os unciforme, is oblong, 

 somewhat spiral, and concave. Near the middle of its anterior 

 surface, a circular plane appears, where the os pisiforme is 

 sustained. 



Os pisiforme is almost spherical, except one circular plane, 

 or slightly hollowed surface, which is covered with cartilage for 

 its motion on the cuneiforme bone, from which its whole 



* A diagram showing the dorsal surface of the bones of the carpus, with 

 their articulations. — The right hand. R. The lower end of the radius. U. The 

 lower extremity of the ulna. F. The inter-articular fibro-cartilage attached to 

 the styloid process of the ulna, and to the margin of the articular surface of the 

 radius. S. The scaphoid bone : the numeral (5) indicates the number of bones 

 with which it articulates. L. The semilunare articulating with five bones. C. 

 The cuneiforme, articulating with three bones. P. The pisiforme, articulating 

 with the cuneiforme only. T. The first bone of the second row — the trapezium, 

 articulating with four bones. T. The second bone — the trapezoides, articulating 

 also with four bones. M. The os magnum, articulating with seven. U. The 

 unciforme, articulating with five. The numerals, 1, 3, 1; 2, 1, on the metacarpal 

 bones, refer to the number of their articulations with the carpal bones. 



