File:Amphibia presumptive organ-forming areas in the late blastula and beginning gastrula.jpg

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Description Fig 169 Presumptive organ-forming areas in the amphibian late blastula and beginning gastrula. (A, B) General epiblast and hypoblast areas of the early and late blastular conditions, respectively. The hypoblast is composed mainly of entodermal or gut-lining structures, whereas the epiblast is a composite of ectodermal (i e epiderma and neural), mesodermal, and notochordal presumptive areas. Observe that the epiblast gradually grows downward over the hypoblast as the late blastula is formed. (C) Beginning gastrula of the urodele, Triton. (Presumptive areas shown according to Vogt '29 ) (D) Same as above, from vegetative pole. (Slightly modified from Vogt, 29 J (E) Lateral view of beginning gastrula of anuran amphibia. (F) Dorsal view of the same (E F derived from description by Vogt. '29, relative to Rana jiisca and Bombinator: also Pasteels: J. Exper. Zool., 89, relative to Discoglossus.) Observe that an antero-posterior progression of somites is indicated in C and D.
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Source https://archive.org/details/comparativeembry00nels/page/335/mode/1up?view=theater&q=BLASTULATION+ Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illustrations.
Author Nelsen, Olin E.

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current20:59, 11 March 2024Thumbnail for version as of 20:59, 11 March 20241,164 × 1,581 (1.61 MB)Rasbak (talk | contribs){{Information |description=Fig 169 Presumptive organ-forming areas in the amphibian late blastula and beginning gastrula. (A, B) General epiblast and hypoblast areas of the early and late blastular conditions, respectively. The hypoblast is composed mainly of entodermal or gut-lining structures, whereas the epiblast is a composite of ectodermal (i e epiderma and neural), mesodermal, and notochordal presumptive areas. Observe that the epiblast gradually grows downward over the hypoblast as the...

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