File:Echidna early blastoderms of the prototherian mammal.jpg
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[edit]DescriptionEchidna early blastoderms of the prototherian mammal.jpg | Fig. 175. Early blastoderms of the prototherian mammal, Echidna. (A) Early blastoderm showing central mass of cells with peripherally placed vitellocytes. (B) Later blastoderm. Central cells are expanding and the blastoderm is thinning out. Smaller cells (in black) are migrating into surface layer. Vitellocytes have fused to form a peripheral syncytial tissue. (C) Later blastoderm composed of a single layer of cells of two kinds. The smaller cells in black represent potential entoderm cells. (D) Increase of hypoblast cells and their migration into the archenteric space below to form a second or hypoblast layer. |
Date | |
Source | https://archive.org/details/comparativeembry00nels/page/362/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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current | 22:02, 11 March 2024 | ![]() | 1,053 × 634 (427 KB) | Rasbak (talk | contribs) | {{Information |description=Fig. 175. Early blastoderms of the prototherian mammal, Echidna. (A) Early blastoderm showing central mass of cells with peripherally placed vitellocytes. (B) Later blastoderm. Central cells are expanding and the blastoderm is thinning out. Smaller cells (in black) are migrating into surface layer. Vitellocytes have fused to form a peripheral syncytial tissue. (C) Later blastoderm composed of a single layer of cells of two kinds. The smaller cells in black represent... |
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