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Encyclopedia > Zona pellucida
Zona pellucida
A human blastocyst

The image above is believed to be a replaceable fair use image. It will be deleted on 2007-02-28 if not determined to be irreplaceable. If you believe this image is not replaceable, follow the instructions on the image page to dispute this assertion.
Human ovum. The zona pellucida is seen as a thick clear girdle surrounded by the cells of the corona radiata.
Gray's subject #3 38
MeSH Zona+Pellucida
Dorlands/Elsevier z_01/12869767

The zona pellucida (or zona striata in older texts) is a glycoprotein membrane surrounding the plasma membrane of an oocyte. It is a vital constitutive part of the latter, external but not extraneous to it. The blastocyst stage of development in the embryos of humans is around 5 days old with 30-150 cells. ... The blastocyst is the structure formed in early mammalian embryogenesis, after the formation of the blastocele, but before implantation. ... 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the Anno Domini (common) era. ... February 28 is the 59th day of the year in the Gregorian calendar. ... File links The following pages link to this file: Ovum Wikipedia:Grays Anatomy images with missing articles 1 Categories: Public domain images ... A human ovum Sperm cells attempting to fertilize an ovum An ovum (plural ova) is a haploid female reproductive cell or gamete. ... The corona radiata surround an ovum or unfertilized egg cell, and consist of two or three strata (layers) of follicular cells. ... Medical Subject Headings (MeSH) is a huge controlled vocabulary (or metadata system) for the purpose of indexing journal articles and books in the life sciences. ... Elseviers logo. ... A glycoprotein is a macromolecule composed of a protein and a carbohydrate (an oligosaccharide). ... Drawing of a cell membrane A component of every biological cell, the cell membrane (or plasma membrane) is a thin and structured bilayer of phospholipid and protein molecules that envelopes the cell. ... An oocyte or ovocyte is a female gametocyte or germ cell involved in reproduction. ...


This structure binds spermatozoa, and is required to initiate the acrosome reaction. Schematic diagram of a sperm cell, showing the (1) acrosome, (2) cell membrane, (3) nucleus, (4) mitochondria, and (5) flagellum (tail) A sperm cell, or spermatozoon ( spermatozoa) (in Greek: sperm = semen and zoon = alive), is the haploid cell that is the male gamete. ... In sperm cells of many higher animals, the acrosome develops over the anterior half of its head. ...


The zona glycoprotein, ZP3, is responsible for sperm binding, adhering to proteins on the sperm plasma membrane. There is evidence that ZP3 is then involved in the induction of the acrosome reaction, whereby a spermatozoon releases the contents of the acrosomal vesicle. A representation of the 3D structure of myoglobin, showing coloured alpha helices. ... In spermatozoa of many animals, the acrosome is an organelle that develops over the anterior half of the spermatozoons head. ...

Contents

Function in humans

In humans, five days after the fertilization the membrane degenerates and decomposes to be replaced by the underlying layer of trophoblastic cells.


The zona pellucida is essential for oocyte survival and fertilization. An oocyte or ovocyte is a female gametocyte or germ cell involved in reproduction. ... Categories: Biology stubs ...


Immunocontraception

Glycoproteins in ZP1, 2, and 3 are targets for immunocontraception.


In non-mammalian animals, the zona pellucida (called vitelline layer) plays an important role in preventing breeding of different species, especially in species that fertilize outside of the body (e.g. fish). The vitelline membrane is a structure directly adjacent to the outer surface of the plasma membrane of an ovum. ... A giant grouper at the Georgia Aquarium Fish are aquatic vertebrates that are typically cold-blooded; covered with scales, and equipped with two sets of paired fins and several unpaired fins. ...


The zona pellucida is commonly used to control wildlife population problems by immunocontraception. When the zona pellucida of one animal species is injected into the bloodstream of another, it results in sterility of the second species due to immune response. This effect can be temporary or permanent, depending on the method used. In New Jersey, Porcine zona pellucida is used to keep deer populations low, and this process is commonly referred to as "spay-vac". For the Bon Jovi album, see New Jersey (album) Official language(s) None, English de facto Capital Trenton Largest city Newark Area  Ranked 47th  - Total 8,729 sq mi (22,608 km²)  - Width 70 miles (110 km)  - Length 150 miles (240 km)  - % water 14. ... Porcine zona pellucida is a form of zona pellucida extracted from the ovaries of pigs. ... Fawn redirects here. ...


Additional images

References

  • Oehninger S (2003). "Biochemical and functional characterization of the human zona pellucida.". Reprod Biomed Online 7 (6): 641-8. PMID 14748962. 
  • Bagnell, C. 2005. "Animal Reproduction". Rutgers University Department of Animal Sciences.

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