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egg membrane


Definition: the investing envelope of the oocyte; a primary egg membrane is produced from ovarian cytoplasm (a vitelline membrane); a secondary egg membrane is the product of the ovarian follicle (the zona pellucida); a tertiary egg membrane is secreted by the lining of the uterine tube (a shell).

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.