THE SKELETON. 59 
from the cuneiform and articulates with the ulna and 
cuneiform. The trapezium is the smallest bone of the 
carpus. It is crescentic in 
shape and articulates with 
the scapholunar, trapezoid, 
and first and second meta- 
carpals. The trapezoid is 
almost as small as the trape- 
zium. It is distinguished by 
its flatness. It articulates 
with the scapholunar, mag- 
Fic. 36. 
A, Dorsal aspect of left manus of cat: a, First phalanx of the pollex; 0, 
second or terminal phalanx; cn, cuneiform; h, head of fourth meta- 
carpal; m, magnum; mt, metacarpal 4; », claw; pi, pisiform; s, 
sesamoid bone; st, scapholunar; fd, trapezoid; tim, trapezium; u, 
unciform; I, 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; 7, radiale or scaphoid; ra, radius; m, 
metacarpals; wu, ulnare or cuneiform; w/, ulna; 1, carpalia I, or 
trapezium; 2, carpalia 2, or trapezoid; 3, carpalia 3, or magnum; 
4 and 5, carpalia 4 and 5, or unciform. 
num, second metacarpal, and trapezium. This bone is not 
visible on the palmar surface of the wrist. The magnum 
articulates with the scapholunar, trapezoid, unciform, and 
second, third, and fourth metacarpals. The wnciform can 
de recognized by its wedge shape. It articulates with the 
scapholunar, cuneiform, magnum, and fourth and fifth meta- 
carpals. Each carpal bone develops from a single center 
except the scapholunar, which develops from two centers. 
