epitheliochorial placenta
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The epitheliochorial placenta is a type of placenta found in animals like hippopotamuses and pigs. In this arrangement, a layer of fetal tissue is pressed against the mother's uterine wall. Unlike more advanced placental types, there is no erosion of the maternal tissues. However, the capillaries beneath the fetal and maternal layers can be very close, allowing for some exchange. The fingerlike projections, or villi, that facilitate contact with the uterus are evenly distributed in epitheliochorial placentas. This type of placenta is less intimate than others, such as the hemochorial placenta found in higher primates, where there are fewer or no cellular layers separating maternal and fetal blood.12
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primatePlacentaIn the first type (epitheliochorial), found in the lemurs and lorises, several cellular layers separate the maternal and fetal bloodstreams and thus limit the passage of molecules of serum proteins. In the second type (hemochorial), found in tarsiers, monkeys, and apes, the relationship is much more intimate, there beingā¦
Read MoreIn the first type (epitheliochorial), found in the lemurs and lorises, several cellular layers separate the maternal and fetal bloodstreams and thus limit the passage of molecules of serum proteins. In the second type (hemochorial), found in tarsiers, monkeys, and apes, the relationship is much more intimate, there beingā¦
Read More- primateClassification
ā¦no menstruation, and a much-less-intimate epitheliochorial placenta. All indications are that these two suborders separated very early, perhaps 60 million years ago. The Strepsirrhini divide further into Lemuriformes (lemurlike) and Lorisiformes (lorislike) infraorders, while the Haplorrhini divide into Tarsiiformes (tarsiers) and Simiiformes (āanthropoidsāāi.e., monkeys, apes, and humans). The Simiiformes divideā¦
Read Moreā¦no menstruation, and a much-less-intimate epitheliochorial placenta. All indications are that these two suborders separated very early, perhaps 60 million years ago. The Strepsirrhini divide further into Lemuriformes (lemurlike) and Lorisiformes (lorislike) infraorders, while the Haplorrhini divide into Tarsiiformes (tarsiers) and Simiiformes (āanthropoidsāāi.e., monkeys, apes, and humans). The Simiiformes divideā¦
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