Indeciduate Placenta || Types

 Indeciduate Placenta

        The indeciduate placenta is met with ungulates, cetaceans, sirenians and lemurs. 

        This type of placenta may be of three different forms namely the diffuse, the cotyledonary and the intermediate types. Here the blastodermic pit is usually elongated or sometimes sausage-like in shape and the foetus is still dependent upon the uterine secretion the "uterine milk" for its food-stuff. 

        The allantois is very conspicuous beneath which there is chorion growing into the familiar villi. In the primitive placenta, the chorionic villi develop a comparative loose connection with the uterine mucosa.

         Upon their removal at the time of birth there is no loss of maternal tissue from the uterine mucosa (endometrium).

1)Diffuse type
2)Cotyledonary type
3)Intermediate type