The vitelline membrane or vitelline envelope is a structure surrounding the outer surface of the plasma membrane of an ovum (the oolemma) or, in some animals (e.g., birds), the extracellular yolk and the oolemma. It is composed mostly of protein fibers, with protein receptors needed for sperm binding which, in turn, are bound to sperm plasma membrane receptors. The species-specificity between these receptors contributes to prevention of breeding between different species.
It is called zona pellucida in mammals. Between the vitelline membrane and zona pellucida is a fluid-filled perivitelline space.
As soon as the spermatozoon fuses with the ovum, signal transduction occurs, resulting in an increase of cytoplasmic calcium ions. This itself triggers the cortical reaction, which results in depositing several substances onto the vitelline membrane through exocytosis of the cortical granules, transforming it into a hard layer called the “fertilization membrane”, which serves as a barrier inaccessible to other spermatozoa. This phenomenon is the slow block to polyspermy.
In insects, the vitelline membrane is called the vitelline envelope and is the inner lining of the chorion.
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The vitellinemembrane or vitelline envelope is a structure surrounding the outer surface of the plasma membrane of an ovum (the oolemma) or, in some animals...
which lies outside the zona pellucida (in mammals), known as the vitellinemembrane in other animals. In insects, it is developed by the follicle cells...
polyspermy. The vitellinemembrane is composed primarily of four glycoproteins proteins, collectively referred to as vitellinemembrane proteins (VMPs)...
between receptors on the vitellinemembrane. The sperm surface protein bindin, binds to a receptor on the vitellinemembrane identified as EBR1. Fusion...
of a human embryo Vitellinemembrane, membrane surrounding an ovum Vitelline veins, veins that drain blood from the yolk sac Vitelline masked weaver (Ploceus...
fertilization, the embryo) are enclosed by the vitellinemembrane, whose structure is different from a cell membrane. The yolk is mostly extracellular to the...
fertilization. In non-mammals, it is called the vitellinemembrane or vitelline envelope. The thick membrane of the zona pellucida functions to only allow...
salamanders, newts and caecilians) — by the development of three extraembryonic membranes (amnion for embryonic protection, chorion for gas exchange, and allantois...
of the vitelline layer, which is made up of glycoproteins; however, channels and proteins are still present for their functions in the membrane. Axolemma:...
sperm. The vitellinemembrane consists of two major layers found below the ovary and the outer layer found in the oviduct. This membrane supports the...
bacteria need to cope with antimicrobial factors in the albumen and vitellinemembrane before migration to the yolk can occur Humphrey TJ (January 1994)...
which increases its size and causes it to stretch and weaken the vitellinemembrane (the clear casing enclosing the yolk). The resulting effect is a flattened...
envelope – the one in contact with the membrane of the egg – is made of glycoproteins and is known as the vitellinemembrane (zona pellucida in mammals). Different...
glycoprotein found mainly in egg whites, as well as in the chalaza and vitellinemembrane. The protein makes up around 2-4% of the protein content of egg whites;...
extracellular matrix present around the egg is the vitelline envelope which becomes the fertilization membrane following the cortical reaction. In mammals,...
many organisms such as the axolotl develop normally even if the vitellinemembrane and jelly layers are removed and development occurs in flowing water...
bacteria need to cope with antimicrobial factors in the albumen and vitellinemembrane before migration to the yolk can occur Humphrey, T. J. (January 1994)...
encompassing all tetrapods, excluding the amniotes (tetrapods with an amniotic membrane, such as modern reptiles, birds, and mammals). All extant (living) amphibians...
the same time. Each egg has a thin, opaque chorion membrane and a thick, transparent vitellinemembrane. Mitopus morio has a very similar appearance, but...
vertebrates, but they have complex eggs or embryos, including an amniotic membrane. Amniotes include reptiles (including dinosaurs and their descendants,...
environment of the small intestine. The actual egg is covered by a vitellinemembrane. When the eggs first exit the uterus of their mother, they are composed...
generally surrounded by the extraembryonic membranes but do not develop a shell, hard or soft, around these membranes. Some fish have thick, leathery coats...
B12-transporting ATPase - vitamin D binding protein domain III - vitellinemembrane outer layer protein I (VMO-I) - WAC protein domain - Western blot...
stress. Due to the abundant presence of Na+/K+-ATPase in the basolateral membrane, ionocytes can often be located using immunohistochemistry. Recruitment...
capillary plexus, is returned by the vitelline veins to the tubular heart of the embryo. This constitutes the vitelline circulation, which in humans serves...
eggs Zygote Related: Candling Chalaza (chalazae) Haugh unit Rompope Vitellinemembrane (yolk) A to Z egg dishes Balut (egg) Bai pong moan Boiled egg Brik...
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