Placentation
Formation and structure of the placenta / From Wikipedia, the free encyclopedia
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Placentation refers to the formation, type and structure, or arrangement of the placenta. The function of placentation is to transfer nutrients, respiratory gases, and water from maternal tissue to a growing embryo, and in some instances to remove waste from the embryo. Placentation is best known in live-bearing mammals (theria), but also occurs in some fish, reptiles, amphibians, a diversity of invertebrates, and flowering plants. In vertebrates, placentas have evolved more than 100 times independently, with the majority of these instances occurring in squamate reptiles.
Placentation | |
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Details | |
Identifiers | |
Latin | placentatio |
MeSH | D010929 |
Anatomical terminology |
The placenta can be defined as an organ formed by the sustained apposition or fusion of fetal membranes and parental tissue for physiological exchange.[1] This definition is modified from the original Mossman (1937)[2] definition, which constrained placentation in animals to only those instances where it occurred in the uterus.