Circulatory Factors Governing the Viability of the Human Placenta, Based on a Morphologic Study

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Abstract
Circulatory factors governing placental viability are presented, based on recent knowledge of placental circulation. With 2 separate vascular systems there is a dual function in tissue viability. Syncytial cells are maintained by their juxtaposition to oxygenated maternal blood. Cytotrophoblastic cells and stromal cells of the chorionic stalks are dependent upon maternal blood. In the absence of circulating oxygenated maternal blood, they will remain viable if the fetal vasculature in the stroma contains circulating oxygenated fetal blood. The amnion and stroma of the umbilical cord is dependent upon the circulation of oxygenated fetal blood.

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