. Comparative dental anatomy. Teeth; Dentistry. 164 COMPARATIVE DENTAL ANATOMY The Perissodactyla are much less numerous as regards their living representatives, although great numbers have lived on the earth in past geological times. It includes the Horse, Rhinoc- eros, Tapir, and their allies. The Horse family has the formula,— . 3-3 1-1 4-4 3-3 AA L ^3 C- n p-m- S m' 3^3 = **• The incisors are broad, thick, and slightly curved, with a valley dipping down into the crown which. Fig. 69.—Teeth of Horse {Equus caballus). when worn produces the well-known mark by which the age of a horse is esti
. Comparative dental anatomy. Teeth; Dentistry. 164 COMPARATIVE DENTAL ANATOMY The Perissodactyla are much less numerous as regards their living representatives, although great numbers have lived on the earth in past geological times. It includes the Horse, Rhinoc- eros, Tapir, and their allies. The Horse family has the formula,— . 3-3 1-1 4-4 3-3 AA L ^3 C- n p-m- S m' 3^3 = **• The incisors are broad, thick, and slightly curved, with a valley dipping down into the crown which. Fig. 69.—Teeth of Horse {Equus caballus). when worn produces the well-known mark by which the age of a horse is estimated (Fig. 69). The canines are long and cubical in the male, but smaller in the female. A considerable space ex- ists between the canine and the premolars. The first premolar is rudimentary, and often becomes a source of irritation. It is popularly called the "wolf-tooth," and is soon shed. The other pre- molars are often as large and complex in pattern. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Thompson, Alton Howard, 1849-1914; Dewey, Martin, 1881-. St. Louis, C. V. Mosby
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