English:
Identifier: humanphysiology00dung (find matches)
Title: Human physiology
Year: 1856 (1850s)
Authors: Dunglison, Robley, 1798-1869
Subjects: Human physiology
Publisher: Philadelphia : Blanchard and Lea
Contributing Library: University of California Libraries
Digitizing Sponsor: Internet Archive
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e jaws, the teethfixed into the jaws, and musclesby which the jaws are moved. Thejaus chiefly determine theshape and dimensions of themouth; the vpper forming an es-sential part of the face, and mov-ing only with the head; the lower,on the contrary, possessing greatmobility. Each of the jaws has aprominent edge, forming a semi-circle, in which the teeth are im-planted. This edge is called thealveolar arch. The teeth are small organs, of adensity superior to bone; andcovered externally by a hard sub-stance called enamel. By many,they have been regarded as bone;but they differ from it in manyessential respects, although they resemble it in hardness and chemicalcomposition. At another opportunity we shall inquire into theirorigin, structure, and developement. We may merely remark, at pre-sent, that by many they are looked upon as analogous to the corneoussubstances, which develope themselves in the tissue of the skin. DeBluinville assimilates them to the hair; and believes, that they are
Text Appearing After Image:
Diagram of the Stomach and Intestines to showtheir course. 1. Stomach. 2. (E5iopliagus. 3. Left, and 4. Rightend of stomach, fl, 6. Ducdenum. 7. Convolutionsof jejunum. 8. Those of ileum. 9. Cjecum. 10. Ver-miform appendix. 11. A.-conding; 12. Transverse;and 1.3. descending colon. 14. Commencement ofsigmoid flexure. 15. Rectum. DIGESTIVE ORGANS. 75 primarily developed in the substance of the membrane lining themouth; and that their enclosure in the substance of the alveolar archesof the jaws occurs subsequently. The number of the teeth is sixteen in each jaw. These are dividedinto cla?ses, according to their shape and use. There are, in each jaw,fonr uIcisores; two ciispidati or canine teeth; fonr bicuspidati; and sixmolares or grinders. Each tooth has three parts:—the crmvji, neck,and faiig or roof.;—the first being the part above the gum ; the secondthat embraced by the gum; and the third, that contained in thealveolus or socket; The crown varies in the different classes. In the
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