vitelline membrane
vitelline membrane The membrane that surrounds the ovum of animals, from which it has been secreted (e.g. in birds this is the membrane surrounding the yolk of the egg). In Drosophila the term is used rather specifically for the membrane that immediately surrounds the plasma membrane of the ovum. In this case it is formed by the fusion of deposits in the intercellular space between the oocyte and columnar follicle cells that surround it.
zona pellucida
zona pellucida A layer of glycoprotein that surrounds the plasma membrane of a mammalian egg cell. It develops as a jelly coat around the primary oocyte and is surrounded by the granulosa cells.
zona pellucida
zona pellucida (zoh-nă pel-oo-sid-a) n. the thick membrane that develops around the mammalian oocyte within the ovarian follicle. See ovum.
zona pellucida
zona pellucida The transparent covering of an oocyte.
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chorion , chorion
1. The outer cellular layer of the embryo sac of reptiles, birds, and mammals. It consists of two epithelial layers, an ectoderm surrounding… Ovum , ovum (ō´vəm), in biology, specialized plant or animal sex cell, also called the egg, or egg cell. It is the female sex cell, or female gamete; the ma… Embryonic Development , All embryonic structures are derived from a single cell formed by the union of two gametes. Every individual organism began as a single cell, which d… Surround , sur·round / səˈround/ • v. [tr.] (usu. be surrounded) be all around (someone or something): the hotel is surrounded by its own gardens| fig. he loves… Egg Membrane , egg membrane The layer of material that covers an animal egg cell. Primary membranes develop in the ovary and cover the egg surface in addition to th… Acinus , ac·i·nus / ˈasənəs/ • n. (pl. -ni / -ˌnī/ ) Anat. 1. a small saclike cavity in a gland, surrounded by secretory cells. 2. a region of the lung suppli…
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Zona pellucida
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Zona pellucida