OLIVEIRA, A. C.; http://lattes.cnpq.br/1659760528867277; OLIVEIRA, Aline Conceição.
Resumen:
The placenta is an organ of great importance in mammalian reproduction to exercise
several functions, among which the most important is the maintenance of pregnancy.
Therefore, this body is quite complex and of such importance. The existing placenta
complexity is due to their anatomy and physiology that are different according to species
that have, due to their structures which are originated from interaction between maternal
and fetal tissues. Four different membranous structures are involved in the development of
the fetus system maternal placental mammals. They are: the corium, the amnion, the yolk
sac and the allantois. There is a great variability of the fetal membranes, whose function is
to classify the types of placental occurring in various mammalian species. This
classification varies according to the villi of the fetal corium and the crypt of the uterine
lining, and then termed as adeciduade and deciduada as well as the distribution of the villi
which are responsible for classifying as diffuse, cotiledonária, zonary and discoid. The
objective of this work was to study the formation and the types of fetal membranes, as well
as the placenta classification, according to the peculiar characteristics of each and placental
retention, which is an existing problem in both farm animals and animals of Pets.