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Description Fig. 155. Cleavage in the chick blastoderm, surface views. (C after Olsen. '42; the rest after Patterson, MO.) (A) First cleavage is approximately meridional. (B) Second cleavage is at right angles to first. (C) Third cleavage planes are vertical as indicated and approximately parallel to one of the other cleavage planes. Considerable inequality may exist at this time. (This figure slightly modified from original.) (D) Seventeencell stage. Observe central and marginal cells. (E) Stage approximating 32-cell condition. (F) Surface view of 64-cell stage; 41 central and 23 marginal cells. (G) Surface view of blastoderm in lower portions of oviduct; 31 marginal and 123 central cells. (H) Later blastoderm, showing 34 marginal and 312 central cells.
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Source https://archive.org/details/comparativeembry00nels/page/313/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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current10:54, 11 March 2024Thumbnail for version as of 10:54, 11 March 2024877 × 816 (582 KB)Rasbak (talk | contribs){{Information |description=Fig. 155. Cleavage in the chick blastoderm, surface views. (C after Olsen. '42; the rest after Patterson, MO.) (A) First cleavage is approximately meridional. (B) Second cleavage is at right angles to first. (C) Third cleavage planes are vertical as indicated and approximately parallel to one of the other cleavage planes. Considerable inequality may exist at this time. (This figure slightly modified from original.) (D) Seventeencell stage. Observe central and margin...

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