zona pellucida


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Related to zona pellucida: blastocyst, Granulosa cells

zona

 [zo´nah] (L.)
1. zone.
zona fascicula´ta the thick middle layer of the adrenal gland.
zona glomerulo´sa the outermost layer of the adrenal cortex.
zona ophthal´mica herpetic infection of the cornea.
zona pellu´cida
1. the transparent, noncellular, secreted layer surrounding an ovum.
Zona pellucida. From Applegate, 2000.
2. area pellucida.
zona radia´ta a zona pellucida exhibiting conspicuous radial striations.
zona reticula´ris the innermost layer of the adrenal cortex.
zona stria´ta a zona pellucida exhibiting conspicuous striations.

zo·na pel·lu·ci·da

an extracellular coat, rich in glycoprotein, surrounding the oocyte; it contains microvilli of the oocyte and cellular processes of follicular cells and appears homogeneous and translucent under the light microscope.
Synonym(s): pellucid zone

zona pellucida

(zō′nə pə-lo͞o′sĭ-də, pĕl-yo͞o′-)
n.
A thick transparent extracellular coat that surrounds the mammalian ovum and is composed of glycoproteins. Spermatozoa bind to the zona pellucida during fertilization.

zona pellucida

[pəlo̅o̅′sidə]
the thick, transparent, noncellular membrane that encloses a mammalian ovum. It is secreted by the maturing oocyte during its development in the ovary and is retained until near the time of implantation. Also called oolemma. See also vitelline membrane.

zona pellucida

The glycoprotein-rich membrane surrounding the plasma membrane of an oocyte (egg), which binds spermatozoa and is required to initiate the acrosome reaction.

zo·na pel·lu·ci·da

(zō'nă pel-lū'sid-ă)
An extracellular coat surrounding the oocyte; it consists of a layer of microvilli of the oocyte, cellular processes of follicular cells, and an intervening substance rich in glycoprotein; it appears homogeneous and translucent under the light microscope.
Synonym(s): pellucid zone.

zona pellucida

a mucoprotein membrane that surrounds the egg of mammals. It is secreted by the ovarian follicle cells.

zona

pl. zonae [L.] zone.

zona alba
the white line in the horse's hoof.
zona arcuata
see zona glomerulosa (see below).
zona fasciculata
the thick middle layer of the adrenal gland.
zona glomerulosa
the outermost layer of the adrenal cortex. Called also zona multiformis.
zona multiformis
see zona glomerulosa (above).
zona pellucida
1. the transparent, noncellular, secreted layer surrounding an ovum.
2. area pellucida.
zona radiata
a zona pellucida exhibiting conspicuous radial striations.
zona reaction
caused by the penetration of the zona pellucida by the spermatozoa.
zona reticularis
the innermost layer of the adrenal cortex.
zona striata
a zona pellucida exhibiting conspicuous striations.
References in periodicals archive ?
Contraception in mice immunized with recombinant zona pellucida subunit 3 proteins correlates with Th2 responses and the levels of interleukin 4 expressed by CD4+ cells.
The zona pellucida also helps prevent both polyspermy and ectopic pregnancies.
Binding of sperm after going through a series of changes in female reproductive tract, termed 'capacitation', to the zona pellucida (ZP) of the oocyte is an important step for successful fertilization.
Partial zona dissection of human oocytes when failure of zona pellucida penetration is anticipated.
Zona pellucida expression, also commonly measured in association with endocrine disruption, did not appear to vary with exposure.
In the case of the female gamete it seems clear that the oocyte envelopes like the zona pellucida (mammals) or the jelly coat (invertebrate eggs) are capable to inhibit transfection.
Opening of the mouse zona pellucida by laser without a micromanipulator.
Damage may also be present in both the zona pellucida and cortical granules of these oocytes," she said.
The agency recently announced it will also be working with the Humane Society of the United States (HSUS) on a pilot project to study using the immunocontraceptive Porcine Zona Pellucida (PZP)--a vaccine that causes female bears' antibodies to block sperm from binding to their eggs--as a non-lethal approach to manage the bear population.
In the rat, zona pellucida lysis occurs on day 5 of pregnancy and the blastocysts then attach to the uterus (Surani, 1975).
That is because the freezing process damages the zona pellucida, the outer shell of the egg, to which the sperm normally must bind before penetrating the egg.