Question

why human placenta is called desiduate placenta?

Answer 1

In higher eutherian mammals including dog, rabbit and man, the degree of intimacy between maternal and foetal tissues increased. The allanto-choric villi become complex and penetrate deeper into the uterine tissue. Chorionic villi fuse with eroded uterine mucosa to various degrees, so that the chorionic epithelium comes to lie in the connective tissue or into the maternal blood, facilitating the passage of substances from the mother to the foetus and vice versa.

Such a placenta is cast off at the time of birth; there is loss, not only of embryonic membranes but also of encapsulating maternal tissue with extensive haemorrhage. Such a placenta is called deciduate placenta, and the uterine wall participating in the formation of such a placenta is the decidua.


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