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File:Echidna early cleavage.jpg

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Description Fig. 161. Early cleavage in Echidna. (Courtesy, Flynn and Hill, '39.) (A) Four-cell stage. (B) Eight-cell stage. (C) About 16-cell stage. Two meridional and four vertical cleavages have occurred. (D) About 32-cell stage. Observe marginal and central cells. (E) Section through blastodisc of 4 to 8-cell stage. (F) Section through blastoderm of 16-cell stage. See (C). (G) Section through blastoderm of 32-cell stage, showing central and marginal cells.
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Source https://archive.org/details/comparativeembry00nels/page/325/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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current15:34, 11 March 2024Thumbnail for version as of 15:34, 11 March 20241,023 × 1,565 (1.41 MB)Rasbak (talk | contribs){{Information |description=Fig. 161. Early cleavage in Echidna. (Courtesy, Flynn and Hill, '39.) (A) Four-cell stage. (B) Eight-cell stage. (C) About 16-cell stage. Two meridional and four vertical cleavages have occurred. (D) About 32-cell stage. Observe marginal and central cells. (E) Section through blastodisc of 4 to 8-cell stage. (F) Section through blastoderm of 16-cell stage. See (C). (G) Section through blastoderm of 32-cell stage, showing central and marginal cells. |date=1953 |sourc...

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