fertilization membrane


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fer·til·i·za·tion mem·brane

a viscous membrane formed on the inner surface of the vitelline membrane from the cytoplasm of the egg cell after entry of the sperm, preventing the entry of additional sperm.

fertilization membrane

a membrane that appears at the surface of the egg after FERTILIZATION. It is effectively a thickened VITELLINE MEMBRANE that may separate from the surface of the egg; it prevents the entry of additional sperms.
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The wrinkling may be due to a lack of space in the tight-fitting fertilization membrane. The embryo is convoluted by furrows that gradually spread over its lumpy surface.
It will develop to hatching in the fertilization membrane that always keeps the same overall size (1.3 mm in diameter).
The formation of the fertilization membrane of the sea urchin egg.
Sequential biochemical and morphological events during assembly of the fertilization membrane of the sea urchin.
After the loss of the fertilization membrane upon hatching, the unciliated portion of the late gastrula enabled it to attach to the substrate, well before the appearance of the brachiolar arms [ILLUSTRATION FOR FIGURE 9F OMITTED].
hexactis, another brooding asteroid overlaying its eggs, the maternal presence is proposed to be essential to help the hatching embryo tear the fertilization membrane (Chia, 1966).
Percentage fertilization was calculated by counting the number of eggs with fertilization membranes in a random sample of more than 100 from each experiment.