| placenta velamentosa | A placenta in which the umbilical cord is attached to the adjoining membranes, with the umbilical vessels spread out and entering the placenta independently. (05 Mar 2000) |
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| cotyledonary placenta | <plant biology> A placenta in which the substance is divided into lobes or cotyledons. (05 Mar 2000) |
| haemochorial placenta | <gynaecology> A type of placenta where the chorion, or membrane enclosing the foetus, comes in direct contact with the mother's blood. Humans have haemochorial placentas. (09 Oct 1997) |
| haemoendothelial placenta | <gynaecology> A haemoendothelial placenta is a type of placenta in which the inner lining (endothelium) of the capillaries of the chorion (membrane enclosing the foetus) comes in direct contact with the mother's blood. (09 Oct 1997) |
| haemomonochorial placenta | <obstetrics> A haemomonochorial placenta is a type of haemochorial placenta (placenta where the chorion, or membrane enclosing the foetus, comes in direct contact with the mother's blood) where a single layer of trophoblast tissue separates the mother's blood from the blood capillaries of the foetus. (09 Oct 1997) |
| Schultze's placenta | A placenta that appears at the vulva with the glistening foetal surface (amnion) presenting. (05 Mar 2000) |
| horseshoe placenta | An exaggerated placenta reniformis curved in the form of a horseshoe; present in some twin pregnancies. (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) |
| dichorionic diamniotic 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) |
| 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) |