extraembryonic coelom

extraembryonic coelom
extraembryonic coelom n the space between the chorion and amnion which in early stages is continuous with the coelom of the embryo proper

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the cavity, lined with mesoderm, that surrounds the embryo from the earliest stages of development. It communicates temporarily with the coelomic cavity within the embryo (peritoneal cavity). Late in pregnancy it becomes almost entirely obliterated by the growth of the amnion, which fuses with the chorion.

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the portion of the coelom external to the embryo, bordered by chorionic mesoderm and the mesoderm of the amnion and yolk sac; it communicates temporarily at the umbilicus with the intraembryonic coelom. Called also chorionic cavity and exocoelom.

Medical dictionary. 2011.

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  • Extraembryonic coelom — Infobox Embryology Name = PAGENAME Latin = GraySubject = GrayPage = Caption = Caption2 = System = CarnegieStage = 6a Days = 12 Precursor = Heuser s membrane GivesRiseTo = MeshName = MeshNumber = DorlandsPre = c 44 DorlandsSuf = 12247640 The… …   Wikipedia

  • extraembryonic coelom — noun : the space between the chorion and amnion which in early stages is continuous with the coelom of the embryo proper …   Useful english dictionary

  • extraembryonic coelom — exocoelom the cavity, lined with mesoderm, that surrounds the embryo from the earliest stages of development. It communicates temporarily with the coelomic cavity within the embryo (peritoneal cavity). Late in pregnancy it becomes almost entirely …   The new mediacal dictionary

  • extraembryonic — Outside the embryonic body; e.g., those membranes involved with the embryo s protection and nutrition which are discarded at birth without being incorporated in its body. * * * ex·tra·em·bry·on·ic .em brē än ik adj situated outside the embryo… …   Medical dictionary

  • Целом Внезародышевый (Extraembryonic Coelom), Экзоцелом (Exocoelom) — полость, выстланная мезодермой, которая окружает эмбрион, начиная с самых ранних стадий его развития. Экзоцелом временно сообщается с целомичсской полостью, расположенной внутри эмбриона (брюшинной полостью). На более поздних сроках беременности… …   Медицинские термины

  • Extra-embryonic coelom — Extraembryonic coelom The extraembryonic coelom (or chorionic cavity) is shown between the two layers of extraembryonic mesoderm (labelled mes. ) in this image of an implanted embryo. Latin coeloma extraembryonicum …   Wikipedia

  • coelom — SYN: body cavity. * * * coe·lom sē ləm n, pl coeloms or coe·lo·ma·ta si lō mət ə the usu. epithelium lined body cavity of metazoans above the lower worms that forms a large space when well developed between the digestive tract and the body wall… …   Medical dictionary

  • Intraembryonic coelom — Infobox Embryology Name = PAGENAME Latin = GraySubject = GrayPage = Caption = Caption2 = System = CarnegieStage = Days = 23 Precursor = lateral plate mesoderm GivesRiseTo = pericardial cavity, pleural cavity, peritoneal cavity MeshName =… …   Wikipedia

  • chorionic cavity — extraembryonic coelom …   Medical dictionary

  • Body cavity — Picture of Human body cavities dorsal body cavity to the left and ventral body cavity to the right. By the broadest definition, a body cavity is any fluid filled space in a multicellular organism. However, the term usually refers to the space… …   Wikipedia

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