Dictionary » Z » Zona



noun, plural: zonae

A band or a layer surrounding a structure


For example, zona pellucida refers to the layer surrounding a mammalian ovum.


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Free-flowing cells and those that are stuck together?

In reference to embryo development - the dividing mass of cells is initially held within a membranous structure - zona pellucida - that is eventully breached shortly before implantation. It has more than a mechnical function as it's involved in sperm binding.

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by JorgeLobo
Wed May 30, 2012 10:49 am
Forum: Cell Biology
Topic: Free-flowing cells and those that are stuck together?
Replies: 2
Views: 2905

Various DNA questions

1: Zona pellucida is the gelatinous extracellular matrix that surrounds the egg, that the sperm has to encounter. The zona pellucida contains 3 glycoproteins, ZP1,2,and 3, which are important in the recognition of the sperm. ...

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by kolean
Sun Jul 11, 2010 4:40 pm
Forum: Evolution
Topic: Various DNA questions
Replies: 8
Views: 5387

Could animal sperm fertilize a human egg?

Guessing it will not breach the egg wall. Chemoattractants and sperm surface proteins designed to bind receptors on the zona pellucida/initiate the acrosomal reaction are species-specific.

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by snowcapk
Sat Mar 29, 2008 8:38 pm
Forum: Molecular Biology
Topic: Could animal sperm fertilize a human egg?
Replies: 5
Views: 19943

Hello friends

... on the afferent arteriole entering the glomerular capsule mainly * hormonal through many different hormones secreted from adrenal medulla and zona glomerulosa in the adrenal cortex and affect mainly efferent areriole and is accompanied by Na and K retension , Also ADH from supra optic and ...

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by ahm_k1
Fri Mar 21, 2008 2:02 pm
Forum: Physiology
Topic: Kidney
Replies: 5
Views: 7544

Cat Ovary Maturing Follicle Microscope Picture

... I need atleast five labels, and I also have a few questions to ask. First, I can identify the ovum itself, the cytoplasm of the ovum, and the Zona Pellucida in the picture. That makes three. I cannot seem to find two more things to identify, and I've had difficulty in finding resources on ...

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by TerrorByte
Thu Oct 25, 2007 10:40 pm
Forum: Cell Biology
Topic: Cat Ovary Maturing Follicle Microscope Picture
Replies: 1
Views: 6617
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