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File:Sus domesticus blastocyst.jpg

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Description Fig. 177. Schematic drawings of early pig development. (A) Early developing blastocyst. (B) Later blastocyst, showing two kinds of cells in the inner cell mass. (C) Later blastocyst, showing disappearance of trophoblast cells overlying the inner cell mass. (D) Later blastocyst. Two layers of formative cells are present as indicated with trophoblast tissue attached at the margins.
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Source https://archive.org/details/comparativeembry00nels/page/364/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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current10:59, 12 March 2024Thumbnail for version as of 10:59, 12 March 20241,016 × 759 (647 KB)Rasbak (talk | contribs){{Information |description=Fig. 177. Schematic drawings of early pig development. (A) Early developing blastocyst. (B) Later blastocyst, showing two kinds of cells in the inner cell mass. (C) Later blastocyst, showing disappearance of trophoblast cells overlying the inner cell mass. (D) Later blastocyst. Two layers of formative cells are present as indicated with trophoblast tissue attached at the margins. |date=1953 |source=https://archive.org/details/comparativeembry00nels/page/361/mode/1up...

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