What is a Chorioallantoic placenta?
Chorioallantoic placentas (i.e., a large chorion fused with a large allantois) occur in certain lizards, in marsupials with long gestation periods, and in mammals above marsupials. The yolk-sac placenta does not invade maternal tissues, but intimate interlocking folds may occur between the two.
What are the different types of placenta?
Summary of Species Differences in Placental Architecture
| Type of Placenta | Common Examples |
|---|---|
| Diffuse, epitheliochorial | Horses and pigs |
| Cotyledonary, epitheliochorial | Ruminants (cattle, sheep, goats, deer) |
| Zonary, endotheliochorial | Carnivores (dog, cat, ferret) |
| Discoid, hemochorial | Humans, apes, monkeys and rodents |
What is non Deciduate placenta?
Non-deciduate (non-deciduos) placenta – Implantation superficial; foetal. chorionic epithelium lies in contact with the uterine epithelium and at the. time of birth the fetal villi are drawn out completely without tearing or. causing injury to the uterine wall and no bleeding occurs eg.
What is a Zonary placenta?
A zonary placenta consists of a belt-shaped band of tissue surrounding the fetus, and is typically found in carnivores. Other animals with this type of placenta include cats and mustelids, a family of carnivores including the weasel, badger, marten and ferret.
What animals have Choriovitelline placenta?
It is a primitive type of placenta found in all marsupials. (However, bandicoots also have a chorioallantoic placenta.) A choriovitelline placenta also forms early in the development of some placental mammals before the chorioallantoic placenta forms and the choriovitelline placenta is resorbed.
What is the Deciduate placenta?
A placenta whose maternal part is shed with delivery.
What is Syndesmochorial placenta?
function in camels and ruminants camels and ruminants possess a syndesmochorial placenta, in which the epithelium of the maternal tissues is eroded to facilitate intercommunication.
What is a Deciduate placenta?
What does exterior placenta mean?
An anterior placenta is when the placenta attaches to the front wall of the uterus. This is a normal place for the placenta to implant and develop, but there are a few things to be aware of if you have one.