The thick, solid, transparent outer membrane of a developed mammalian ovum. Also called oolemma.
[New Latin zōna pellūcida : Latin zōna, belt, girdle + Latin pellūcida, feminine of pellūcidus, transparent.]
Dictionary:
zo·na pel·lu·ci·da (zō'nə pə-lū'sĭ-də, pĕl-yū'-) ![]() |
[New Latin zōna pellūcida : Latin zōna, belt, girdle + Latin pellūcida, feminine of pellūcidus, transparent.]
| 5min Related Video: zona pellucida |
| Medical Dictionary: zona pel·lu·ci·da |
The thick solid transparent outer membrane of a developed mammalian ovum. Also called oolemma.
| WordNet: zona pellucida |
The noun has one meaning:
Meaning #1:
thick membrane around the mammalian ovum; can be penetrated by one sperm in the fertilization process; usually remains around the fertilized egg until it is implanted in the wall of the uterus
| Wikipedia: Zona pellucida |
| Zona pellucida | |
|---|---|
| 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 |
The zona pellucida (plural zonae pellucidae) 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 zona pellucida first appears in multilaminar primary oocytes.
This structure binds spermatozoa, and is required to initiate the acrosome reaction. 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.
In humans, five days after the fertilization, the blastocyst performs zona hatching; the zona pellucida degenerates and decomposes to be replaced by the underlying layer of trophoblastic cells.
The zona pellucida is essential for oocyte death and fertilization.
In some older texts, it has also been called zona striata and stratum lucidum[1] (not to be confused with the stratum lucidum of the skin).
Contents |
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 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".
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First stages of segmentation of a mammalian ovum. |
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![]() | Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved. Read more | |
![]() | Medical Dictionary. The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Read more | |
![]() | WordNet. WordNet 1.7.1 Copyright © 2001 by Princeton University. All rights reserved. Read more | |
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