Quain's elements of anatomy . Fig. 468.—Canine tooth of the upper jaw. «, front view ; b, lateral view, showing the long fanggrooved on the side. The apex of the fang is generally bifid, and in the second upper bicuspid the root is often cleft for a considerable distance ; but the bicuspid teeth are very variable in this respect, and may be, all four, free fiom any trace of bifidity of the root. The upper bicuspids are larger than the lower ones, and their : cusps are more deeply divided. Sometimes the first i lower bicuspid has only one tubercle distinctly marked, j , the external, and in
Quain's elements of anatomy . Fig. 468.—Canine tooth of the upper jaw. «, front view ; b, lateral view, showing the long fanggrooved on the side. The apex of the fang is generally bifid, and in the second upper bicuspid the root is often cleft for a considerable distance ; but the bicuspid teeth are very variable in this respect, and may be, all four, free fiom any trace of bifidity of the root. The upper bicuspids are larger than the lower ones, and their : cusps are more deeply divided. Sometimes the first i lower bicuspid has only one tubercle distinctly marked, j , the external, and in that case approaches in figure J to a canine tooth. Fig. r The molar teeth (fig. 470), true or large molars, or grinders, are \ twelve in number, and are arranged behind the bicuspid teeth, three on ? each side, above and below. They are distinguished by the large size of the crown, and by the great width of its grinding surface. The first molar is the largest, and the third is the smallest, in each range, so as to produce a gradation of size in these teeth. The last of the range, N X 2 548 THE TEETH. OAving to its late appearance through the gum, is called the wisdom-footli. The crowns of the molar teeth are low and cuboid in their generalform. Their outer and inner surfaces are convex, but the crowns arerather flattened before and behind. The grinding surface is nearly-square in the lower teeth, and rhomboidal in the upper, the corners beingrounded off; it bears four or five trihedral tubercles or cusps (whencethe name multicusirldati), separated from each other by a crucial de-pression. Fig. 469. Fig. 470.
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Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
