80 



THE BONES. 



The fourth, or os scaphoides, the most voluminous of the row, has only 

 four facets, and articulates by its inferior face with the os magnum and 



trapezoides. -,„,■,■, „ , t ^ 



Collectively, the second, third, and fourth bones of the upper row torm 



two articular surfaces. - _ . , , , • 



The superior, or radial articular surface, is very irregular ; but m ex- 

 amining it from' without to within there may be observed: 1, A glenoid 

 cavity on the pyramidal bone; 2, In front, a transversely-elongated condyle 



Fiff. 45. 



Fig. 46. 



POSTEBIOR VIEW OF THE EIGHT 

 CAKPUS. 

 1, Second cuneiform, or pyramidalis ; 2, 

 Third, or lunare ; 3, Fourth, or sca- 

 phoides; 4, First, supercarpal, pisiform, 

 or trapezium ; 5, First of lower row, 

 or unciform; 6, Second, or magnum; 

 7, Third, or trapezoides ; *, *, Small 

 ' metacarpal bones. 



FRONT VIEW OF RIGHT CARPUS. 

 , Second of upper row, or cuneiform ; 

 2, Third, or lunare; 3, Fourth, or 

 scaphoides ; 4, First, supercarpal, or 

 trapezium ; 5, First of second row, or 

 unciform ; 6, Second, or magnum ; 

 7, Third, or trapezoides. 



on the semilunar and scaphoid bones ; 3, A groove placed behind the pre- 

 ceding condyle. 



The inferior articulating surface, which corresponds to the second row, 

 is constituted by several undulated facets ; it is convex outwardly and in 

 front, concave posteriorly and inwardly. 



Bones of the Inferior or Metacarpal Eow. — The thickness of these 

 bones decreases from without to within. 



The first, unciform, or Jiookbone (os hamatum), has four diarthrodial 

 facets, and responds, above, to the two first bones of the superior row ; 

 below, to the first and second metacarpals. 



The second, os magnum, or os capitatum, the largest, has seven articular 

 facets, three of which are on the interno-lateral face. It articulates, above, 



