File:Elasmobranchii early cleavage phenomena.jpg
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[edit]DescriptionElasmobranchii early cleavage phenomena.jpg | Fig. 158. Early cleavage phenomena in elasmobranch fishes. (A, B, E. F, G after Ziegler, '02, from Riichert; C, D after Ziegler. ) (A) Germ disc of Torpedo ocellata, showing four cleavage nuclei, sperm nuclei, and beginning of first cleavage furrow. (B) Stage of cleavage, possessing 16 cleavage nuclei. Four central cells and ten marginal cells are evident from surface view. (C) Surface view of blastoderm of Scyllium canicula with 64 cleavage nuclei. Twenty-nine central cells and seventeen marginal cells are evident from surface view. (D) Later cleavage stage of S. canicula with 145 cells showing. (E) Transverse section of (B). (F) Transverse section of blastoderm of T. ocellata with 64 cells. (G) Median section through blastoderm of T. ocellata at the end of the cleavage period. |
Date | |
Source | https://archive.org/details/comparativeembry00nels/page/318/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 | 11:11, 11 March 2024 | ![]() | 1,007 × 826 (806 KB) | Rasbak (talk | contribs) | {{Information |description=Fig. 158. Early cleavage phenomena in elasmobranch fishes. (A, B, E. F, G after Ziegler, '02, from Riichert; C, D after Ziegler. ) (A) Germ disc of Torpedo ocellata, showing four cleavage nuclei, sperm nuclei, and beginning of first cleavage furrow. (B) Stage of cleavage, possessing 16 cleavage nuclei. Four central cells and ten marginal cells are evident from surface view. (C) Surface view of blastoderm of Scyllium canicula with 64 cleavage nuclei. Twenty-nine cent... |
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