File:Anatomy, descriptive and surgical (electronic resource) (1860) (14764612282).jpg

Identifier: b20386424 (find matches)
Title: Anatomy, descriptive and surgical (electronic resource)
Year: 1860 (1860s)
Authors: Gray, Henry, 1825-1861 Carter, H. V., ill Westmacott, John Guise, Dr, ill
Subjects: Anatomy
Publisher: London : J.W. Parker
Contributing Library: Wellcome Library
Digitizing Sponsor: Wellcome Library

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d by smooth and vascular mucous membrane, which is remarkablefor its limited sensibility. Around the necks of the teeth, this membranepresents numerous fine papillfB; and from this point it is reflected into thealveolus, where it is continuous with the periosteal membrane lining thatcavity. The Teeth. The human subject is provided with two sets of teeth, which make theirappearance at dilFerent periods of life. The first set appear in childhood, and arecalled the temporary^ deciduous^ or milk teeth. The second set, which also appearat an early period, continue until old age, and are named permanent. The temporary teeth are twenty in number; four incisors, two canine, and fourmolars, in each jaw. Th.Q permanent teeth are thirty-two in number; four incisors, two central andtwo lateral, two canine, four bicuspids, and six molars, in each jaw. General characters. Each tooth consists of three portions; the crown, or body, 320.—The Permanent Teeth. External View. JSicuspids Canine Incisors
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Cecnine which projects above the gum; the root, or fang, entirely concealed within thealveolus; and the neck, the constricted portion between the other two. The roots of the teeth are firmly implanted within the alveoli: these depressionsare lined with periosteum, which is reflected on to the tooth at the point of thefang, and covers it as far as the neck. At the margin of the alveolus, theperiosteum becomes continuous with the fibrous structure of the gums. 6i4 ORGANS OF DIGESTION. Permanent Teeth. The Incisoes, or cutting teeth, are so named from their presenting a sharp,cutting edge, adapted for cutting the food. They are eight in number, and formthe four front teeth in each jaw. The crown is directed vertically, is wedge-like in form, being bevelled at theexpense of its posterior surface, so as to terminate in a sharp, horizontal cuttingedge, which, before being subject to attrition, presents three small prominentpoints. It is convex, smooth, and highly polished in front; slightly

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