CHAP, iv.] THE SKELETON OF THE LIMBS. 99 



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 hoth 



BONES OF RIGHT FORE-PAW. 



Fig. 57. PALMAR SURFACE. 



s. (Above) scapho-lunar bone. 



s. (Below) sesamoid. 



tm. Trapezium. 



ii. Unciform bone. 



c. Cuneiform bone. 



m. Magnum. 



me. Metacarpals. 



p. Pisiform. 



p 1 . Proximal phalanx. 



p a . Middle phalanx. 



p 3 . Distal phalanx. 



I. Pollex. 



II. Index. 



III. Medina. 



IV. Annulus. 



V. Minimus. 



Fig. 58. DORSAL SURFACE. 



si. Scapho-lunare. 

 td. Trapezoides. 

 tm. Trapezium. 

 u. Unciform bone, 

 c. Cuneiform bone. 

 TO. Magnum, 

 me. Metacarpals. 

 p. Pisiform. 

 p 1 . Proximal phalanx. 

 p. Middle phalanx. 



?. Distal phalanx. 

 Pollex. 



II. Index. 



III. Medius. 



IV. Annulus. 



V. Minimus. 



from without inwards and 



concave and convex. It is convex 

 convex from before backwards. 



The trapezoides (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 magnum (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 (u) is that carpal which lies on the ulnar side of 



H 



