Placenta

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Placenta is the intimate connection between the foecus and uterine wall of the mother to exchange the materials. In humans, chorion takes part in the formation of placenta hence called chorionic placenta. It consists of foetal part, the chorion and a maternal part, the decidua basalis.
The degree of intimacy is so strong that the blood vessels of the chorionic villi are bathed in the mother.s blood. This type of placenta which is based on the intimacy between foetal and maternal parts of the placenta is referred to as haemochorial placenta, It provides nutrition, aids in respiration and excretion of the foetus.
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Assertion:The placentation in which the placenta forms a ridge along the ventral suture of ovary and ovules are borne on this ridge forming two rows is called parietal placentation. Reason:The marginal placentation has ovules developed on the inner wall of the ovary or on peripheral part.

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