Placenta refers to the structure through which nutrients and wastes are exchanged between the mother and the developing child; The structure through which the exchange of materials be tween fetal and maternal circulations occurs.

Moreover, Placenta is an organ connected to the uterine wall and to the fetus by the umbilical cord. the placenta serves as a relay station between mother and fetus for the exchange of nutrients and wastes; an organ, formed from the lining of the uterus and the chorion, that provides for respiration and nourishment of the unborn child and the elimination of its metabolic wastes.