placentation

placentation /pla·cen·ta·tion/ (pla?sen-ta´shun) the series of events following implantation of the embryo and leading to development of the placenta.

---

plac·en·ta·tion (plsn-tshn)

n.

1. Formation of a placenta in the uterus.

2. The type or structure of a placenta.

---

placentation

1. the series of events following implantation of the embryo and leading to development of the placenta.

2. the nature of the implantation. See also placenta.

---

adventitial placentation

developmental of additional areas outside the normal areas, e.g. intercotyledonary in cattle.

cotyledonary placentation

the areas of placentation are limited to caruncles, approximately circular masses scattered over the placenta. Characteristic of the cow, ewe and goat doe.

diffuse placentation

the whole of the surface of the chorion is placental.

intercotyledonary placentation

abnormal placental attachments between the cotyledons, in cows.

zonal placentation

only some zones of the placenta have a vascular area involved in placentation. Characteristic of the bitch and the queen.

Zonary placenta of carnivores. By permission from Sack W, Wensing CJG, Dyce KM, Textbook of Veterinary Anatomy, Saunders, 2002