This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 Excerpt: ...the basal layer of which pushes into the cutis, and at the same time the mesenchyme cells of the latter layer multiply beneath the centre of the ectodermal ingrowth, pushing it outward, so that the basal layer forms a cup with the opening toward the deeper tissues (fig. 210). The mesenchyme within the cup forms the ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 Excerpt: ...the basal layer of which pushes into the cutis, and at the same time the mesenchyme cells of the latter layer multiply beneath the centre of the ectodermal ingrowth, pushing it outward, so that the basal layer forms a cup with the opening toward the deeper tissues (fig. 210). The mesenchyme within the cup forms the dental papilla, while the ectoderm cells lining the cup form the enamel organ. With farther development the outer cells of the papilla are converted into odontoblasts, so-called from their function of forming a bone-like substance, the dentine or ivory of the tooth. This, in accordance with the method of its formation by secretion from the ends of the odontoblasts, has a prismatic structure. The basal surface of the enamel organ secretes a denser substance, the enamel, which lies like a cap, firmly united to the top and sides of the dentine. By continued additions to the deeper portions of the dentine the tooth is gradually forced up through the epithelium so that its tip or crown comes into position for use (eruption of the tooth). Fig. 210.--Section of developing tooth germ of Amblystoma. e, epidermis; eo, enamel organ; m, Malpighian layer; me, mesenchyme; p, pulp of tooth. In the lower vertebrates there may be a separate invagination of the ectoderm for each tooth, but in the mammals there is a continuous ingrowth, the dental ridge (fig. 211) along the margin of the jaw. Later this becomes differentiated into separate enamel organs and dental papillae, the separate teeth developing much as Fig. 211.--Model of ectodermal parts of jaw of human embryo 40 mm. long, after Rose, showing the dental ridge with the enamel organs for the first teeth. in other groups. From the posterior side of this dental ridge there arises a continuous projection, the ...
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Add this copy of Comparative Anatomy of Vertebrates to cart. $19.33, poor condition, Sold by Anybook rated 4.0 out of 5 stars, ships from Lincoln, UNITED KINGDOM, published 1912 by John Murray.
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This is an ex-library book and may have the usual library/used-book markings inside. This book has hardback covers. In poor condition, suitable as a reading copy. No dust jacket. Please note the Image in this listing is a stock photo and may not match the covers of the actual item, 950grams, ISBN:
Add this copy of Comparative Anatomy of Vertebrates to cart. $34.95, good condition, Sold by J.E. Miles, A Bookseller rated 5.0 out of 5 stars, ships from OCEANSIDE, CA, UNITED STATES, published 1912 by Blakiston's Son & Co.
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Add this copy of Comparative Anatomy of Vertebrates: -1912 to cart. $47.11, new condition, Sold by Revaluation Books rated 4.0 out of 5 stars, ships from Exeter, DEVON, UNITED KINGDOM, published 2009 by Cornell University Library.
Add this copy of Comparative Anatomy of Vertebrates to cart. $49.07, new condition, Sold by Revaluation Books rated 4.0 out of 5 stars, ships from Exeter, DEVON, UNITED KINGDOM, published 2009 by BiblioBazaar.
Add this copy of Comparative Anatomy of Vertebrates to cart. $51.14, new condition, Sold by Revaluation Books rated 4.0 out of 5 stars, ships from Exeter, DEVON, UNITED KINGDOM, published 2009 by BiblioBazaar.
