Vitelline membrane
[L. vitellus - yolk of an egg]. A thin non-cellular membrane secreted by the oocyte and follicular cells that surround an oocyte and that will form the fertilization membrane if sperm penetration occurs.
vitelline membrane
Delicate membrane that surrounds the yolk of an egg.
vomerine teeth
found on the roof of the buccal cavity, medial to the internal nares, on either side of the midline in frogs.
vitelline membrane The noncellular membrane that encloses the egg cell.
The zona pellucida is a thick layer of extracellular matrix that surrounds the egg and is similar to the role of the vitelline membrane in sea urchins.
Induction of sperm acrosome reaction by perivitelline membrane glycoprotein ZP1 ... Acrosome reaction induced by recombinant human zona pellucida 3 peptides ...
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As soon as the spermatozoön has entered the yolk, the peripheral portion of the latter is transformed into a membrane, the vitelline membrane which prevents the passage of additional spermatozoa.
 See also: Membrane, Sperm, Fertilization, Egg, Cells
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