698 



CARPUS. 



face is convex and articulates with the radius. Its lower 

 surface is concavo-convex and articulates with the trape- 

 zium and trapezoid. Its ulnar or inner surface articulates 

 FIG. 219. with the os-lunare and os mag- 



num, while its external or radial 

 face gives attachment to the ex- 

 ternal lateral ligament. 



The os-lunare, so called from 

 its semi-lunar shape, is convex 

 ahove to receive the radius, and 

 concave helow to articulate with 

 the magnum and unciforme. Its 

 ulnar surface joins the cuneiform, 

 its radial the scaphoid. 



The os-cuneiforme, so named 

 from its wedge-like shape, is on 

 the ulnar side of the lunar, and articulates with it. The 

 lower surface is concave, and articulates with the unci- 

 forme, and its anterior surface is flat and smooth where it 

 joins the pisiforme. 



The os pisiforme, so called from its resemblance in size 

 and form to a pea, is the smallest bone in the wrist, and is 

 situated upon the palmar surface of the last, with which it 

 is articulated. It gives insertion to the flexor carpi ulnaris 

 above, and origin to the abductor minimi digiti below. 



The trapezium is the first bone on the radial side of the 

 second row; it is concave above to receive the scaphoid, 

 and below it joins the metacarpal bone of the thumb. 

 Internally it articulates with the trapezoides and second 

 metacarpal bone ; on its anterior surface is observed a 

 groove for the tendon of the flexor carpi radialis. 



The trapezoides is smaller than the last, with which it 

 articulates, and of very irregular shape. Above it is con- 



FIG. 219 represents the Carpus, a Ulna, b Radius, clnter-articular-fibro 

 cartilage, d Metacarpal bone of the thumb, e Metacarpal bone of the first 

 finger. /Metacarpal bone of the second finger, g Metacarpal bone of the 

 third finger, h Melacarpal bone of the fourth finger. S Scaphoides. L Lu- 

 nare. C Cuneiforme. P Pisiforme. T T Trapezium and trapezoides. M 

 Os magnum. U Unciforme.j ^ 



