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Fig. 141.—YELK SEGMENTATION.
A. Impregnated ovum, with a single segmentation nucleus. h. External envelope. z. Zona pellucida, with spermatozoa. n. Segmentation nucleus. y. Protoplasm or yelk of the ovum.
B. Ovum, with the yelk divided into two cleavage cells, each with its nucleus. é. Epiblastic cleavage cell. t. Hypoblastic cleavage cell.

C. Fourth segmention into eight cells—four epiblastic and four hypoblastic.
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Source https://archive.org/details/catintroduction00miva/page/319/mode/1up?view=theater The cat : an introduction to the study of backboned animals, especially mammals
Author Mivart, St. George Jackson, 1827-1900

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current01:02, 18 March 2024Thumbnail for version as of 01:02, 18 March 20241,202 × 470 (563 KB)Rasbak (talk | contribs){{information |description=Fig. 141.—YELK SEGMENTATION.<br> A. Impregnated ovum, with a single segmentation nucleus. h. External envelope. z. Zona pellucida, with spermatozoa. n. Segmentation nucleus. y. Protoplasm or yelk of the ovum.<br> B. Ovum, with the yelk divided into two cleavage cells, each with its nucleus. é. Epiblastic cleavage cell. t. Hypoblastic cleavage cell.<br> C. Fourth segmention into eight cells—four epiblastic and four hypoblastic. |date=1881 |source=https://archive.org...

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