vitelline membrane


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Related to vitelline membrane: fertilization membrane, Corona radiata

vitelline membrane

[vī′tel‚ēn ′mem‚brān]
(cell and molecular biology)
The cytoplasmic membrane on the surface of the mammalian ovum.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Internal layers (Figs 10-15) and pharate first instar nymph inside egg (Figs 16-18): Pharate first instar nymph enclosed by three layers within shell (exochorion), identified as endochorion (outermost), vitelline membrane, and cast off embryonic exuvia (innermost).
enteritidis onto the outside of the vitelline membranes of intact egg yolks, the immediate refrigeration of contaminated samples prevented the penetration of S.
A rapid method for evaluating the strength of the vitelline membrane of the hen's egg yolk.
Modification and gelatin coating of the vitelline membrane by glutaraldehyde cross-linking
Once the spermatozoon passes through the zona pellucida, it becomes lodged in the perivitelline space, makes contact with the membrane of the oocyte (vitelline membrane), and is eventually engulfed by the oocyte (Figure 14-9).
As has been established by Selman & Wallace (1983), vitellogenin circulates in the blood and displaces among the endothelial cells of the capillaries and subsequently among follicle cells, reaching the region where microvilli extend through the pores of the vitelline membrane (Selman & Wallace 1983, 1986, Smythe 2003).
Parameter Groups II Group I and III Maternal-Fetal interface Vascular congestion + + Infiltrate of - - leuococytes Apopitotic changes in desidua - +++ Trophoblast giant cells Phagocytotic vacuoles - ++ Cell number - + Cell volume - - Degeneration - ++ Atypical shape - ++ Nuclear polymorphism - ++ Trophopspongium Glycogen cells - - Undifferentiated cells - - Cell number - ++ Labyrinth Vascular congestion + ++ Decreased and - ++ irregular vessel formation Vitelline membrane - - Umbilical cord - - No changes: -; Mild changes: +, Moderate changes: ++; Severe changes: +++
Degeneration of the vitelline membrane was evident at all treatment levels; severity was dose-related and greater in the outer vitelline membrane than the inner vitelline membrane.
The usually much thinner vitelline membrane represents the innermost layer (Hinton 1981; Margaritis 1985).
Polyspermy can occur when the concentration of sperm lysin becomes so high that the vitelline membrane is completely dissolved, leading to low or no fertilization (Lewis et al.