Definitions for placentation
the formation of the placenta in the uterus
arrangement of the ovules in the placenta and of the placentas in the ovary
the local fusion of the embryonic stage of an animal to its parent for physiological exchange to promote the growth and development of the young; involves a placenta in non-egglaying mammals
the mode of formation of the placenta in different animals; as, the placentation of mammals
the mode in which the placenta is arranged or composed; as, axile placentation; parietal placentation
U.S. National Library of Medicine
The development of the PLACENTA, a highly vascularized mammalian fetal-maternal organ and major site of transport of oxygen, nutrients, and fetal waste products between mother and FETUS. The process begins at FERTILIZATION, through the development of CYTOTROPHOBLASTS and SYNCYTIOTROPHOBLASTS, the formation of CHORIONIC VILLI, to the progressive increase in BLOOD VESSELS to support the growing fetus.
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