. The anatomy of the domestic animals. Veterinary anatomy. 480 DIGESTIVE SYSTEM OF THE PIG cavity. The lower canine may reach a length of eight inches or more (ca. 20 cm.); the crown is prismatic and is curved backward and outward in front of the upper one, so that the friction between the two keeps a sharp edge on the lower tooth. In the sow they are much smaller.' The cheek teeth increase in size from before backward. They have (with certain exceptions noted below) complex tuberculate crowns; the term bunodont is applied to this condition, as distinguished from the lophodont and selenodont s
. The anatomy of the domestic animals. Veterinary anatomy. 480 DIGESTIVE SYSTEM OF THE PIG cavity. The lower canine may reach a length of eight inches or more (ca. 20 cm.); the crown is prismatic and is curved backward and outward in front of the upper one, so that the friction between the two keeps a sharp edge on the lower tooth. In the sow they are much smaller.' The cheek teeth increase in size from before backward. They have (with certain exceptions noted below) complex tuberculate crowns; the term bunodont is applied to this condition, as distinguished from the lophodont and selenodont structure in horses and cattle, in which there are prominent ridges of Fig. 415.—Superficial Glands of Head of Pig. a, Parotid gland; a', a", cervical and mandibular angles of a; b, c, ventral and dorsal buccal glands; d, labial glands; e, masseter muscle; /, /', lymph glands; g, dotted line indicating outline of mandibular gland, which is con- cealed. (EUenberger-Baum, Anat. d. Haustiere.) They are short-crowned teeth with a distinct neck and round, pointed roots. The first tooth in each jaw is small, simple, and appears only once; in the lower jaw it is near the canine; in the upper, near the second cheek tooth.^ The next two teeth are larger, laterally compressed, and sectorial. The fourth tooth below is larger, but otherwise like the preceding ones, white the upper one is much wider and is tuberculate. The first premolar has two roots, the others three or four. The molars have four roots, but the anterior pair may be largely fused. 1 The canines of the pig are "permanent pulp" teeth and therefore capable of continued growth, and are without roots in the strict sense. The convex surface is covered with enamel, the concave with cement. ^ It is often absent in the lower 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 n
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