File:Amia calva cleavage in the egg.jpg
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DescriptionAmia calva cleavage in the egg.jpg | Fig. 153. Cleavage in the egg of Amia calva. (After Dean, 1896.) (A) Egg mem branes of Amia, showing the filamentous (villous) layer attaching the egg to the stem of a water weed. (B) Second cleavage plane shown cutting through the protoplasmic disc at one pole of the egg. Section made parallel to the first cleavage plane. (C) First and second cleavage planes seen from above. (D) Third cleavage planes are vertical in position as indicated. (E) Fourth cleavage, sectioned in a plane approximately parallel to first (or second) cleavage. (F) Section through protoplasmic disc at eighth cleavage. (G) Blastular stage. Blastocoel is indistinct and scattered between (?) blastomeres of blastoderm. The description given by Whitman and Eycleshymer (1897) does not agree in certain features with the above. |
Date | |
Source | https://archive.org/details/comparativeembry00nels/page/310/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 | 10:42, 11 March 2024 | 1,002 × 827 (776 KB) | Rasbak (talk | contribs) | {{Information |description=Fig. 153. Cleavage in the egg of Amia calva. (After Dean, 1896.) (A) Egg mem branes of Amia, showing the filamentous (villous) layer attaching the egg to the stem of a water weed. (B) Second cleavage plane shown cutting through the protoplasmic disc at one pole of the egg. Section made parallel to the first cleavage plane. (C) First and second cleavage planes seen from above. (D) Third cleavage planes are vertical in position as indicated. (E) Fourth cleavage, secti... |
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