File:Carpenter's principles of human physiology (1881) (14594539330).jpg

Identifier: carpentersprinci00carp (find matches)
Title: Carpenter's principles of human physiology
Year: 1881 (1880s)
Authors: Carpenter, William Benjamin, 1813-1885 Meneses, Henry Power
Subjects: Human physiology Physiology
Publisher: London : J. & A. Churchill
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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Text Appearing Before Image:
Vertical section of the Lower Jaw of a Human Fcefus, mea-suring about four inches in length, magnified 25 diam.—1,dental groove; 2, remains of the enamel germ; 3, enamelorgan, presenting epithelium on both its outer and inner sur-face—i.e., where it lines the saeculus and where it covers thepapilla; 4, enamel germ of the permanent tooth; 5, papilla;6, section of inferior maxilla; 7, Meckels cartilage. The den-tal saeculus will be observed to present a number of finepapilla opposite the dental papillae. CONNECTIVE TISSUES TEETH. 57 direct calcification of the long columnar cells, the deposition of the calcareoussalts taking place with tolerable uniformity in their outer ends. When thecalcification has proceeded to a certain extent, the calcified part may be raised Fig. 47.
Text Appearing After Image:
Thin section of the inner portion of the Dentine, and of the surface of thePulp, of an adult Incisor Tooth.—a, portion in which calcification is complete,showing separate globular masses at the line of junction with the uncalcifiedsubstance, b; at c, odontoblasts. in the form of a membrane (Raschkows membrana preformativa), from thesubjacent softer tissue; and thus, as Huxley first demonstrated, the enamel isa petrified epithelium. The formation of the cement is identical with the process ofintra-membranous ossification in bone. The matrix of the cement is the loosemucous connective tissue of the dental alveoli immediately surrounding theteeth.* As early as the fifth month, before the calcification of the primitivepulps commences, a provision is made for the production of the permanentteeth, the capsules of which originate in buds or offsets from the upper partof the capsules of the temporary or milk teeth. These offsets are at first inthe condition of open follicles communicating w

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