vitelline membrane


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Related to vitelline membrane: fertilization membrane, Corona radiata

vitelline membrane

n.
1. An extracellular coat that surrounds the egg in invertebrates and most nonmammalian vertebrates. Also called vitelline envelope.
2. The zona pellucida.

vitelline membrane

(vɪˈtɛlɪn; -aɪn)
n
(Zoology) zoology a membrane that surrounds a fertilized ovum and prevents the entry of other spermatozoa

vitel′line mem′brane


n.
the membrane surrounding an egg yolk.
[1835–45]
References in periodicals archive ?
Quality assessments, such as the Haugh unit measure of egg protein quality, vitelline membrane strength, the pH of the yolk and albumen of the eggs were not significantly different after the high-voltage atmospheric cold plasma treatment.
During extended storage, particularly at high temperature, yolk flattening because of osmotic migration from the albumen through the weaker vitelline membrane reduces the YI [13].
The sperm motility, the capability to undertake the acrosome reaction, the ability to fuse with the vitelline membrane of the egg, and the DNA integrity; all are susceptible to oxidative damage (De-Lamirande and Gagnon, 1992).
The appearance of the vitelline membrane and follicular cell layer assists the identification of this developmental stage, as reported for Hypostomus strigaticeps (Takahashi et al.
These pseudo-embryos displayed the three layers typical of embryos (ectoderm, mesoderm and endoderm), and extra-embryonic structures such as the Vitelline membrane and even signs of blood cell formation.
The integrity of vitelline membrane depends mainly on the temperature and time of storage (Anonymous, 2002).
enteritidis is not often deposited inside the nutrient-rich yolks of naturally contaminated eggs, penetration by the bacteria through the vitelline membrane into the yolk could result in a rapid increase in bacterial levels.
Another obvious change that can be observed during egg ageing is the flattening of the yolk caused by the weakening of the vitelline membrane [3].
The vitelline membrane of the hen's egg (VMHE) is transparent fibrous bilayer which encloses the yolk.
The inner acrosomal membrane and the plasma membrane of the sperm adhere to some of the numerous microvilli of the vitelline membrane.
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).