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File:Didelphidae early development of blastoderm.jpg

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Description Fig. 176. Early development of blastoderm of the opossum. (Modified from Hartman, '16.) (A) Blastocyst wall composed of one layer of cells from which entoderm ceils are migrating inward. (B-D) Later development of the formative portion of the blastoderm. Two layers of cells are present in the formative area, viz., an upper epiblast layer and a lower hypoblast. Trophoblast cells are shown at the margins of the epiblast and hypoblast layers.
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Source https://archive.org/details/comparativeembry00nels/page/363/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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current01:47, 12 March 2024Thumbnail for version as of 01:47, 12 March 20241,045 × 788 (621 KB)Rasbak (talk | contribs){{Information |description=Fig. 176. Early development of blastoderm of the opossum. (Modified from Hartman, '16.) (A) Blastocyst wall composed of one layer of cells from which entoderm ceils are migrating inward. (B-D) Later development of the formative portion of the blastoderm. Two layers of cells are present in the formative area, viz., an upper epiblast layer and a lower hypoblast. Trophoblast cells are shown at the margins of the epiblast and hypoblast layers. |date=1953 |source=https:/...

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