The great Tertiary volume corresponds to those volumes of Cuvier which treat of the placental animals that suckle their young.
Sometimes the thrombus may be traced back to the placental site.
No female was recorded to have contained embryos, but two had enlarged uteri or placental scars.
This fact turns the scale in favour of its affinities to the placental insectivora.
When the rupture or abortion does not tear the placental site the fetus may develop in the abdominal cavity.
The animals distinguished by this quality are grouped together as the placental Mammals.
When the ectopic ovum begins to develop in the Fallopian tube the placental villi erode the tubal wall and the blood-vessels.
The period of pregnancy at which hmorrhage may come on from placental presentation, varies very considerably.
Such evidence as there is seems rather to suggest that South Africa was the cradle of the placental mammals.
The foal may, however, die from the cessation of the placental circulation unless it is speedily delivered.
1670s of plants, 1690s of mammals, from Modern Latin placenta uterina "uterine cake" (so called 16c. by Italian anatomist Realdo Colombo), from Latin placenta "a cake, flat cake," from Greek plakoenta, accusative of plakoeis "flat," related to plax (genitive plakos) "level surface, anything flat," from PIE *plak- (1) "to be flat" (cf. Greek plakoeis "flat," Lettish plakt "to become flat," Old Norse flaga "layer of earth," Norwegian flag "open sea," Old English floh "piece of stone, fragment," Old High German fluoh "cliff"), extended form of root *pele- (2) "flat, to spread" (see plane (n.1)). So called from the shape.
placenta pla·cen·ta (plə-sěn'tə)
n. pl pla·cen·tas or pla·cen·tae (-tē)
The membranous vascular organ in female mammals that permits metabolic interchange between fetus and mother. It develops during pregnancy from the chorion of the embryo and the decidua basalis of the maternal uterus and permits the absorption of oxygen and nutritive materials into the fetal blood and the release of carbon dioxide and nitrogenous waste from it, without the direct mixing of maternal and fetal blood. It is expelled following birth.
An organ that forms in the uterus after the implantation of a zygote. The placenta moves nourishment from the mother's blood to the embryo or fetus; it also sends the embryo or fetus's waste products into the mother's blood to be disposed of by the mother's excretory system. The embryo or fetus is attached to the placenta by the umbilical cord. After birth, the placenta separates from the uterus and is pushed out of the mother's body.