Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A thick transparent extracellular coat that surrounds the mammalian ovum and is composed of glycoproteins. Spermatozoa bind to the zona pellucida during fertilization.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun anatomy A
glycoprotein membrane surrounding theplasma membrane of anoocyte
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun 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
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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In IVF, the outer membrane of the egg the zona pellucida is an efficient barrier in preventing the penetration of sperm that have DNA damage.
A Baby at Last! Mark L. Fuerst 2010
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As it slowly travels the length of the tube it continues to divide but still remains cloistered within the zona pellucida, the hard outer covering or “shell” of your original egg.
Getting Pregnant Niels H. Lauersen 2000
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By the aid of the microscope we find that these ova are composed of granular substance, in which is found a miniature yolk surrounded by a transparent membrane called the zona pellucida.
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By the aid of the microscope we find that these ova are composed of granular substance, in which is found a miniature yolk surrounded by a transparent membrane called the zona pellucida.
Searchlights on Health The Science of Eugenics B. G. Jefferis
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Structure of the Ovum (continue) • A distinct perivitelline space is seen between the cell membrane (vitelline membrane) and the zona pellucida.
Recently Uploaded Slideshows saktivinayaga 2010
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The process involves injecting the bar codes, made from silicon, in the perivitelline space of embryos, the space between an embryo's cell membrane and its protective outer cover, known as the zona pellucida.
FOXNews.com foxnewsonline@foxnews.com 2010
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Enzymes present in the acrosomal granule must be released to facilitate sperm penetration through the zona pellucida.
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Fifty feet away, for the second time this year, an embryologist rinses Imogene’s eggs and weakens the zona pellucida and injects one good sperm into each one.
Memory Wall Anthony Doerr 2010
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Fifty feet away, for the second time this year, an embryologist rinses Imogene’s eggs and weakens the zona pellucida and injects one good sperm into each one.
Memory Wall Anthony Doerr 2010
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Special enzymes in the head of the sperm help in penetrating the zona pellucida, the egg’s hard outer shell.
Getting Pregnant Niels H. Lauersen 2000
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