. The physiology of the domestic animals; a text-book for veterinary and medical students and practitioners. Physiology, Comparative; Domestic animals. Fig. 96.—Lower Incisor Tooth of Horse. (JVuhn.) r, worn-down surface of table of tooth, showing the alternate layers of enamel, a; z, dentine; and a-, dis- colored cement filling infundibulum. of this central depression in the incisor teeth of the horse, through the gradual wearing down of the surface, an index is furnished of the age of the horse,—a matter which will subsequently be alluded to. The molar teeth of herbivorous animals
. The physiology of the domestic animals; a text-book for veterinary and medical students and practitioners. Physiology, Comparative; Domestic animals. Fig. 96.—Lower Incisor Tooth of Horse. (JVuhn.) r, worn-down surface of table of tooth, showing the alternate layers of enamel, a; z, dentine; and a-, dis- colored cement filling infundibulum. of this central depression in the incisor teeth of the horse, through the gradual wearing down of the surface, an index is furnished of the age of the horse,—a matter which will subsequently be alluded to. The molar teeth of herbivorous animals compound teeth,— that is, the enamel dips down below the surface of the crown, and in some animals, as in the elephant, the com- z- pound teeth may be regarded as a series of flattened teeth arranged side by side in the jaw, and connected only by the cement, or crusta petrosa (Figs. 97 and 98). This substance is like that invari- ably found covering the fangs of teeth, but which only in compound teeth appears upon the crown. The pointed fang or fangs of teeth are pierced b3r an opening which communicates with a cavity in the centre of the body of the tooth, called the pulp-cavity, which contains blood- FlG Upper Mdlar of vessels and nerves which enter through horse, showing wear of & Table. {Nuhn.) the Opening in the fang, and in the pillp- ct, depression on table: pi, depression on side; «, enamel; z, dentine; C'ae, cement: n. ex- cavity ramify over a delicate fibro-cellular ternal or ^<xni surface; ;, internal or oral ** ** surface. structure constituting the pulp (Fig. 99), The pulp is continuous over its surface with an infinite number of small projections which extend into the tubes of dentine in the inner structure of the tooth. These three different substances, which constitute the substances of. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearanc
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectphysiol, bookyear1890
