What are the different protective layer of the chick egg primary,secondary and tertiary?
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the investing envelope of the oocyte; a primary egg membrane is produced from ovarian cytoplasm (for example, a vitelline membrane); a secondary egg membrane is the product of the ovarian follicle (for example, the zona pellucida); a tertiary egg membrane is secreted by the lining of the uterine tube (for example, a shell).
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On the basis of origin, egg- membranes are divided into three parts
(1) Primary egg membrane: Oocyte secretes this membrane Examples: Zona Pellucida, Vitelline membrane etc.
(2) Secondary egg membrane: This is seen outside the primary egg membrane & is secreted by the ovary. Examples: Chorion, corona radiata
(3) Tertiary egg membrane: This is present outside the primarveca membrane uterus or the oviduct. Examples: Jelly coat, Shell & Shell membrane.
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