624 



MAMMALIAN ANATOMY 



FIG. 489. 

 Proximal End. 



With Trapezium. 



Radial Side. 



Ulnar Side. 



With Proximal Phalanx 

 of Thumb. 



Distal End. 



FIRST LEFT METACARPAL, DORSAL SURFACE. 



and convex from side to side. The ulnar part of the palmo-ulnar 

 surface affords origin to the first dorsal interosseous muscle. Its radial 

 border is much shorter than the ulnar border, and the palmar border 

 is not well defined. 



Fro. 400 

 Proximal End. 



Palmar Side. 



Dorsal Side. 



Tubercle. 



Articular Surjace of Head, 

 far Proximal Phalanx of Thumb. 



Distal End. 



FIRST LEFT METACARPAL, RADIAL SURFACE. 



The Head consists of a cylindrical articular surface placed so 

 obliquely to the shaft of the bone that it faces equally in the distal 

 and the radial direction. On the palmar surface (Fig. 491) where the 



FIG. 491. 



Proximal End. 



Ulnar Side. 



With Trapezium. 



Tubercle. _ 



Radial Side. 



With Proximal Phalanx 

 of Thumb. 



Distal End. 



FIRST LEFT METACARPAL, PALMAR SURFACE. 



