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Chorionic villi are villi that sprout from the chorion to provide maximum contact area with maternal blood. They are an essential element in pregnancy from a histomorphologic perspective, and are, by definition, a product of conception. Branches of the umbilical arteries carry embryonic blood to the villi. After circulating through the capillaries of the villi, blood returns to the embryo through the umbilical veins. Thus, villi are part of the border between maternal and fetal blood during pregnancy. ==Structure== Villi can also be classified by their relations: * Floating villi float freely in the intervillous space. They exhibit a bi-layered epithelium consisting of cytotrophoblasts with overlaying syncytium (syncytiotrophoblast). * Anchoring (stem) villi stabilize mechanical integrity of the placental-maternal interface. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「chorionic villi」の詳細全文を読む スポンサード リンク
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