THE METACARPUS 



229 



convex and articulates with the hamate, and one on its radial side, which articulates 

 with the fourth metacarpal. On its ulnar side is a prominent tubercle for the inser- 

 tion of the tendon of the Extensor carpi ulnaris. The dorsal surface of the body 



For greater For 3rd 



- lesser multangular metacarpal For For lesser 

 multangular capitate mult- 



angular 



FIG. 230. The second metacarpal. (Left.) 



Styloid For 2nd 

 process meta- 

 carpal 



FIG. 231. The third metacarpal. 



For 



capitate 



For 4th 

 metacarpal 



(Left.) 



is divided by an oblique ridge, which extends from near the ulnar side of the base 

 to the radial side of the head. The lateral part of this surface serves for the attach- 

 ment of the fourth Interosseus dorsalis; the medial part is smooth, triangular, and 

 covered by the Extensor tendons of the little finger. 



For 

 capitate 



For 3rd For 



metacarpal hamate 



For 5th 

 meta- 

 carpal 



For 4tk 

 metacarpal 



FIG. 232. The fourth metacarpal. (Left.) 



For hamate 

 FIG. 233. The fifth metacarpal. (Left.) 



Articulations. Besides their phalangeal articulations, the metacarpal bones articulate as 

 follows: the first with the greater multangular; the second with the greater multangular, lesser 

 multangular, capitate and third metacarpal; the third with the capitate and second and fourth 

 metacarpals; the fourth with the capitate, hamate, and third and fifth metacarpals; and the 

 fifth with the hamate and fourth metacarpal. 



