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placental cotyledon
In human development, the cotyledons are the approximately 15-25 separations of the decidua basalis of the placenta, separated by placental septa.〔Page 565 in: ()〕 Each cotyledon consists of a main stem of a chorionic villus as well as its branches and subbranches etc.〔
==Vasculature==
The cotyledons receive fetal blood from chorionic vessels, which branch off ''cotyledon vessels'' into the cotyledons, which, in turn, branch into capillaries. The cotyledons are surrounded by maternal blood, which can exchange oxygen and nutrients with the fetal blood in the capillaries.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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