The Primary Factors of Organic Evolution
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In our eReader you can find the full English version of the book. Read The Primary Factors of Organic Evolution Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book The Primary Factors of Organic Evolution
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In fishes and reptiles where teeth occasionally pre- sent very primitive conditions, the theory of the origin of particular types of molar teeth is more simple than in the case of Mammalia. The observations of Hiiter on the action of osteoblasts under stimulus show that under moderate irritation osseous tissue is deposited, while under severe pressure osseous tissue is removed. Koelliker has shown that the action of these bodies is the same in dentine as in true bone. Hence modifica- tions of d...ental structure must stand in close relation to the uses to which they are put. Thus severe pressure on a simple tooth crown would, if long continued, cause it to expand laterally, or in the direction of least re- sistance, and to grow but little in its vertical axis, i. E. , in the direction of greatest resistance. The molar teeth have been subjected to much more severe direct irritation from use than any others in the jaws, and this will account for their increased diameters.
In the case of the eutherian Mammalia, molar teeth are not traceable back to ancestral types of reptilian mo- lars, but to simple conic (haplodont) reptilian teeth.
What to read after The Primary Factors of Organic Evolution?
You can find similar books in the "Read Also" column, or choose other free books by Cope, E. D. (Edward Drinker), 1840-1897 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
In fishes and reptiles where teeth occasionally pre- sent very primitive conditions, the theory of the origin of particular types of molar teeth is more simple than in the case of Mammalia. The observations of Hiiter on the action of osteoblasts under stimulus show that under moderate irritation osseous tissue is deposited, while under severe pressure osseous tissue is removed. Koelliker has shown that the action of these bodies is the same in dentine as in true bone. Hence modifica- tions of d...ental structure must stand in close relation to the uses to which they are put. Thus severe pressure on a simple tooth crown would, if long continued, cause it to expand laterally, or in the direction of least re- sistance, and to grow but little in its vertical axis, i. E. , in the direction of greatest resistance. The molar teeth have been subjected to much more severe direct irritation from use than any others in the jaws, and this will account for their increased diameters.
In the case of the eutherian Mammalia, molar teeth are not traceable back to ancestral types of reptilian mo- lars, but to simple conic (haplodont) reptilian teeth.
What to read after The Primary Factors of Organic Evolution?
You can find similar books in the "Read Also" column, or choose other free books by Cope, E. D. (Edward Drinker), 1840-1897 to read onlineMoreLess
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