THE METACARPUS. 



123 



The second metacarpal articulates above with the 

 trapezoid, and laterally with the trapezium, os magnum, 

 and third metacarpal ; its distal extremity articulates 



FIG. 57. CAKPTTS, METACARPUS, AND PHALANGES, PALMAR SURFACE. 



with the first phalanx of the index finger. Its base is 

 large, cuboidal; the shaft long, prismoid, presenting a 

 dorsal and two lateral surfaces ; the head is rounded; the 

 articular surface, as in the other metacarpal bones, 



