CHAP. IV.] 



THE SKELETON OF THE LIMBS. 



\ 



The trapezium (tm) is the smallest carpal and the most radial of the 

 distal series. It supports the pollex or most radial digit, for which 

 it presents a saddle-shaped articular surface, namely, one both 



m * 



BONES OF RIGHT FORE-PAW. 



Fig. 57.— Palmar Surface. 



s. (Above) seaplio-lunar bone. 



8. (Below) sesamoid. 



tm. Trapezium. 



It. Unciform lione. 



c. Cuneiform boue. 



VI. Magnum. 



mc. Metacarpals. 



J). Pisiform. 



p\ Proximal pli.alanx. 



p\ Middle phalanx. 



jfl. Distal phalanx, 



I. Pollex. 



II. Index. 



III. Medius, 



IV. Annulus. 



V. Minimus. 



Fig. 58.— D0R3AL Surface. 



si. Scapho-lunare. 

 td. Trapezoides. 

 tm. Trapezium. 

 It. Unciform bone, 

 c. Cimetform bone. 

 m. Magnum. 

 mc. Metacarpals. 

 p. Pisiform. 

 j)i. Proxinml phalanx, 

 p'. Middle phalanx. 

 jA Distal phalanx. 



I. PoUex. 



II. Index. 



III. Medius. 



IV. Annulus. 



V. Minimus. 



concave and convex. It is convex from \7ith0ut inwards and 

 convex from before backwards. 



The trajjezoides (td) is also a small carpal. It articulates distally 

 by a slight convexity, with the second metacarpal bone only. It is 

 very little visible on the palmar surface. 



The OS magnimi (m) is considerably larger than the two preceding 



carpals. It is convex above at its so-called *' head.'* It articulates 



below with three metacarpals, but mainly with the third, into the 



proximal concavity of which it projects. 



The unciform bone («) is that carpal which lies on the ulnar side of 



n 



