File:Hand-book of physiology (1892) (14578451510).jpg

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Identifier: handbookofphysio00bake (find matches)
Title: Hand-book of physiology
Year: 1892 (1890s)
Authors: Baker, W. Morrant, (William Morrant), 1839-1896 Harris, Vincent Dormer Kirkes, William Senhouse, 1823-1864. Hand-book of physiology. 13th ed
Subjects: Physiology Human physiology
Publisher: London : John Murray
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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s membrane of the mouth, which first becomes thickened inthe neighbourhood of the maxillae or* jaws now in the courseof formation. This process passes downward into a recess of theimperfectly developedtissue of the embryonicjaw. The downwardepithelial growth formsthe ^imary enamelorgan or enamel germ,and its position is indi-cated by a slight groovein the mucous membraneof the jaw. The nextstep in the process con-sists in the elongationdownward of the enamelgroove and of the enamelgerm and the inclinationoutward of the deeperpart (fig. 78, B,f), whichis now inclined at anangle with the upperportion or neck (/), andhas become bulbous.After this there is anincreased developmentat certain points corre-sponding to the situa-tions of the future milk-teeth. The enamelgerm, or common enamelgerm, as it may be called,becomes divided at itsdeeper portion, or exten-ded by further growth,into a number of specialenamel germs correspon-ding to each of theabove-mentioned milk-teeth, and connected to
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Kg. 78A. Section of the upper jaw of a foetal sheep. , common enamel germ dipping down intothe mucous membrane; 2, palatine process ofjaw ; 3, Rete Malpighi. B — Section similar to A,but passing through one of the special enamelgerms here becoming flask-shaped ; c, c, epithe-lium of mouth; f, neck ; /, body of specialenamel germ. C.—A later stage; c, outline ofepithelium of gum; /, neck of enamel germ;/, enamel organ; p, papilla; s, dental sac form-ing ; fp, the enamel germ of permanent tooth;m, bone of jaw ; v, vessels cut across. (Waldeyerand Kolliker.) Copied from Quains Anatomy. the common germ by a narrow neck. Each tooth is thus placed in its own special recess in the embryonic jaw (fig. 78, b, //). As these changes proceed, there grows up from the underlying 82 STKUCTURE OF THE ELEMENTAEY TISSUES, (ch. in.

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