Zona pellucida

Zona pellucida
The strong membrane that forms around an ovum as it develops in the ovary. The membrane remains in place during the egg’s travels through the fallopian tube. To fertilize the egg, a sperm must penetrate the thinning zona pellucida. If fertilization takes place, the membrane disappears to permit implantation in the uterus.

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zona pel·lu·ci·da -pə-'lü-sə-də n the transparent more or less elastic noncellular glycoprotein outer layer or envelope of a mammalian ovum often traversed by numerous radiating striae

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the thick membrane that develops around the mammalian oocyte within the ovarian follicle. It is penetrated by at least one spermatozoon at fertilization and persists around the blastocyst until it reaches the uterus. See ovum.

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1. pellucid zone: a thick, transparent, noncellular layer or envelope of uniform thickness surrounding an oocyte; called also oolemma. Under the light microscope it appears as a radially striated layer; under the electron microscope this can be seen to be microvillous, so that it is called the z. radiata, z. striata, or striated membrane. 2. area pellucida.

Medical dictionary. 2011.

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Look at other dictionaries:

  • Zona pellucida — Zona o na, n.; pl. {Zon[ae]}. [L., a girdle. See {Zone}.] A zone or band; a layer. [1913 Webster] {Zona pellucida}. [NL.] (Biol.) (a) The outer transparent layer, or envelope, of the ovum. It is a more or less elastic membrane with radiating… …   The Collaborative International Dictionary of English

  • zona pellucida — zona pellucida. См. вителлиновый слой. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • Zona pellucĭda — Zona pellucĭda, s. Embryonalhüllen …   Meyers Großes Konversations-Lexikon

  • Zona pellucida — Zona pellucida, extrazelluläre, glykoproteinreiche Schicht, die als Eihülle das Säugerei umgibt …   Deutsch wörterbuch der biologie

  • zona pellucida — [zō′nə pə lo͞o′si də] n. pl. zonae pellucidae [zō′nē pə lo͞o′si dē] the clear, thick outer membrane that surrounds and protects the mature egg of a mammal: it has receptors on its surface that bind with sperm cells …   English World dictionary

  • Zona pellucida — Эмбрион человека, окруженный Zona pellucida. лат. Zona pellucida (ранее также zona stria …   Википедия

  • Zona pellucida — Infobox Anatomy Name = PAGENAME Latin = GraySubject = 3 GrayPage = 38 Caption = Caption2 = Human ovum. The zona pellucida is seen as a thick clear girdle surrounded by the cells of the corona radiata. Precursor = System = Artery = Vein = Nerve =… …   Wikipedia

  • Zona pellucida — Menschliche Eizelle mit der sie als weißer Gürtel umgebenden Zona pellucida, welche ihrerseits in die Corona radiata eingebettet ist. Die Zona pellucida oder Glashaut ist eine Schutzhülle um die Eizelle (Ovozyte), die von den kubischen… …   Deutsch Wikipedia

  • Zona pellucida — skaidrioji sritis statusas T sritis embriologija atitikmenys: lot. Membrana pellucida; Zona pellucida ryšiai: platesnis terminas – danga sinonimas – skaidrioji membrana …   Medicininės histologijos ir embriologijos vardynas

  • Zona pellucida — skaidrioji sritis statusas T sritis histologija, ląstelių chemija, histologinė chemija, audinių kultūra atitikmenys: lot. Zona pellucida ryšiai: platesnis terminas – spindulinis vainikas siauresnis terminas – ovocitas sinonimas – skaidrioji zona …   Veterinarinės anatomijos, histologijos ir embriologijos terminai

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