Author: Glossary
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Placenta increta
A form of placenta accreta in which the chorionic villi invade the myometrium.
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Incarcerated placenta
A placenta retained in the uterus by irregular uterine contractions after delivery. The placenta remains inside the uterus due to a spasm that causes the womb’s exit to constrict, creating an opening too narrow for the placenta to be expelled.
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Horseshoe placenta
A formation in which the two placentae of a twin gestation are united. In a twin pregnancy, a situation where two placentas are fused together.
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Hemoendothelial placenta
A placenta in which the maternal blood is in contact with the endothelium of the chorionic vessels.
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Hemochorial placenta
A placenta in which the maternal blood is in direct contact with the chorion. The human placenta is of this type.
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Fundal placenta
A placenta attached to the uterine wall within the fundal zone. The placenta is attached at the top of the uterus, which is the usual position.
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Fetal placenta
That part of the placenta formed by aggregation of chorionic villi in which the umbilical vein and arteries ramify.
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Placenta fenestrata
A placenta in which a portion of the placental tissue is thinning or absent. A four-sided placenta with an irregular shape that has a central opening.
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Epitheliochorial placenta
A placenta in which the chorion is next to the lining of the uterus but does not invade or erode the lining.
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Endotheliochorial placenta
A placenta in which the syncytial trophoblasts of the chorion penetrate to the blood vessels of the uterus.