74 



ELEMENTS OF MAMMALIAN ANATOMY. 



unciform form the distal row. The scapholunar, easily 

 distinguished because of its large size, articulates with the 

 radius, cuneiform, unciform, magnum, trapezoid, and tra- 

 pezium. The cuneiform articulates with the ulna, unci- 

 form, pisiform, and scapho- 

 lunar. The pisiform is next 

 to the scapholunar in size. 

 It projects prominently 

 laterad from the cuneiform 

 and articulates with the 

 radius, ulna, and cuneiform. 

 The trapezium is the small- 

 est bone of the carpus. It is 



A. B. 



FIG. 36. 



A, Dorsal aspect of left manus of cat : a, First phalanx of the pollex ; b, 



second or terminal phalanx ; en, cuneiform ; h, head of fourth meta- 

 carpal ; m, magnum ; mt, metacarpal 4 ; n, claw ; pi, pisiform ; .9, 

 sesamoid bone; st, scapholunar; td, trapezoid; tm, trapezium; u, unci- 

 form ',1,2, and 3, first, second, and third phalanges of the middle digit. 



B, Generalized type of carpus as found in lower vertebrates : c, Centrale ; 



1, intermedium or lunare ; r, radiale or scaphoid ; ra, radius ; m, meta- 

 carpals; u, ulnare or cuneiform; ?</, ulna; 1, carpalia 1, or trapezium; 



2, carpalia 2, or trapezoid; 3, carpalia 3, or magnum; 4 and 5, car- 

 palia 4 and 5, or unciform. 



crescentic in shape and articulates with the scapholunar, 

 trapezoid, and first and second metacarpals. The trap- 

 ezoid is almost as small as the trapezium. It is distin- 

 guished by its flatness. It articulates with the scapho- 



