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- W1985629148 abstract "A light- and electron microscopic study of the establishment and differentiation of the chorioallantoic placenta in Tadarida has been completed. A hemochorial placental relationship has been shown to exist throughout the entire functional state of this structure. Maternal endothelium is present in the larger vessels but not in the smaller channels of the labyrinth. The electron microscope has revealed that the trophoblast surrounding the maternal channels is cellular, not syncytial as previously thought, and that the apical plasma membrane of these trophoblastic cells is in direct contact with the maternal blood. The misconception of an “enucleate” maternal endothelium has been shown to be the result of activity by the trophoblast. The trophoblast displaces a homogeneous substance that is present in the center of the trophoblastic cord prior to maternal blood flow to an intermittent ring beneath the surface of the cells. A thin layer of trophoblastic cytoplasm remains above this ring in contact with the maternal blood. This layer was previously interpreted as an “enucleate” maternal endothelium. A sparse population of microvilli extends from the trophoblast into the maternal blood and, as the length of gestation increases, numerous coated vesicles are seen within the trophoblastic portion of the barrier. At term, the placental barrier may be reduced to less than 0.04 μ. This barrier comprises a thin layer of trophoblast—a basement membrane common to both the trophoblast and the fetal endothelium which is also part of the barrier." @default.
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- W1985629148 date "1969-09-01" @default.
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- W1985629148 title "The development and fine structure of the allantoic placental barrier in the bat Tadarida brasiliensis cynocephalal" @default.
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- W1985629148 doi "https://doi.org/10.1016/s0022-5320(69)80028-6" @default.
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