| horseshoe placenta | An exaggerated placenta reniformis curved in the form of a horseshoe; present in some twin pregnancies. (05 Mar 2000) |
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| spontaneous correction of placenta previa | The upward "migration" of the placenta away from the internal os by the differential growth rates of upper and lower uterine segments. (05 Mar 2000) |
| nondeciduous placenta | A placenta in which the foetal placenta is cast off, leaving the uterine mucosa intact (e.g., an epitheliochorial placenta). (05 Mar 2000) |
| succenturiate placenta | An extra placenta separate from the main placenta. In anatomy succenturiate means substituting for or accessory to an organ. In this case, a succenturiate placenta is an accessory placenta. (12 Dec 1998) |
| deciduate placenta | A placenta in which the maternal decidua is cast off with the foetal placenta. (05 Mar 2000) |
| supernumerary placenta | A succenturiate or accessory placenta. (12 Dec 1998) |
| syndesmochorial placenta | In ruminant animals, a type of placenta in which the chorion is attached to maternal connective tissue. (05 Mar 2000) |
| disperse placenta | A placenta in which the umbilical arteries divide dichotomously before entering the placental substance. (05 Mar 2000) |
| incarcerated placenta | Incomplete separation of the placenta and its failure to be expelled at the usual time after delivery of the child. Synonym: incarcerated placenta. (05 Mar 2000) |
| in the placenta | Intervillous fibrin with ischemic necrosis of villi. (05 Mar 2000) |
| total placenta previa | Placenta previa in which the placenta entirely covers the internal os of the cervix. Synonym: central placenta previa, total placenta previa. (05 Mar 2000) |
| endotheliochorial placenta | A placenta in which the chorionic tissue penetrates to the endothelium of the maternal blood vessels. (05 Mar 2000) |
| endothelio-endothelial placenta | A placenta in which the endothelium of the maternal vessels comes in direct contact with the endothelium of the foetal vessels to form the placental barrier. (05 Mar 2000) |
| epitheliochorial placenta | A placenta in which the chorion is merely in contact with, and does not erode, the endometrium. (05 Mar 2000) |
| twin placenta | The placenta(s) of a twin pregnancy; if dizygotic, the placenta's may be separate or fused, the latter retaining two amniotic and two chorionic sacs (dichorionic diamniotic placenta); if monozygotic, the placenta may be a (05 Mar 2000) |