File:Image from page 39 of "Water reptiles of the past and present" (1914) (14586321279).jpg
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DescriptionImage from page 39 of "Water reptiles of the past and present" (1914) (14586321279).jpg |
Identifier: waterreptilesofp1914will Title: Water reptiles of the past and present Year: 1914 (1910s) Authors: Williston, Samuel Wendell, 1851-1918 Subjects: Aquatic reptiles Publisher: Chicago, Ill., The University of Chicago Press Contributing Library: Boston Public Library Digitizing Sponsor: Boston Public Library
Click here to view book online to see this illustration in context in a browseable online version of this book.
Text Appearing After Image: Fig. 12.—Procoelous vertebra of snake: sa, zygantrum; zs, zygosphene; pz, pos-terior zygapophysis. or muscles, for articular union with adjacent vertebrae, or for thesupport of ribs, and these processes have characteristic differencesin different reptiles. The pair in front and behind, for articulationwith the adjoining vertebrae, may become obsolete or even lost inswimming reptiles, as we shall see; they are called zygapophyses.In not a few reptiles there is an additional pair for zygapophysialarticulation in front and behind, called zygosphene and zygantrum,for the greater strengthening of the column; they are especiallycharacteristic of snakes and certain lizards. In certain otherreptiles, especially the long-necked dinosaurs, there is an addi-tional pair arranged differently from the zygophene, that havereceived the names hyposphene and hypantrum. On the top of the arch is the spine or spinous process, whichmay vary enormously in size and length; sometimes it is flattened THE SK
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Source | Image from page 39 of "Water reptiles of the past and present" (1914) |
Author | Internet Archive Book Images |
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31 August 2015
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