. Elements of hippology ... Horses. ELEMENTS OF HIPPO LOGY. 31 Seventh: The mark, the dental star, and the shape of the tables. All the details above enumerated are preliminary to the ex- amination of the tables of the teeth and confirmatory of what is to be learned from them. The structure of the incisors is the same for all: A central cavity, the pulp cavity, containing the nerves, blood-vessels, and secreting tissues, is contained in the axis of the tooth. Sur- rounding this pulp cavity is dentine, a dense and ivory-like sub- stance, forming the body of the tooth. This dentine in the per- f
. Elements of hippology ... Horses. ELEMENTS OF HIPPO LOGY. 31 Seventh: The mark, the dental star, and the shape of the tables. All the details above enumerated are preliminary to the ex- amination of the tables of the teeth and confirmatory of what is to be learned from them. The structure of the incisors is the same for all: A central cavity, the pulp cavity, containing the nerves, blood-vessels, and secreting tissues, is contained in the axis of the tooth. Sur- rounding this pulp cavity is dentine, a dense and ivory-like sub- stance, forming the body of the tooth. This dentine in the per- fect tooth has a deep hollow i n i t s outer end. Over the surface | of thetooth and lining the depres- sion in its outer end, is enamel, white, very hard, and of varying thickness. The depression in the tooth soon becomes discolored frornthe debris of decomposing food lodging there. The enamel that crowned the tooth at its appearance soon wears off, but the enamel on the outside of the tooth and that lining its central depression still shows in cross-section on the table of the tooth. The blackened spot in the center of the tooth, with its surround- ing ring of white enamel, is called the mark, and is present in every permanent incisor for about three years after its appear- ance. By this time, in the ordinary case, the grinding of the teeth against each other has worn off that part of the tooth con-. Figure 21.—Cross-Section of Center Incisor. Drawn by Captain C. B. Hagadorn, 23d U. S. Infantry. 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 Marshall, Francis Cutler. [from old catalog]; United States. Military academy, West Point. Dept. of tactics. [from old catalog]. Kansas City : Hudson press
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