Placental membranes - Definition

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The term deciduous is an adjective related to things that become detached, like the leaves of a tree in autumn. In the medical field, the placental membranes refer to the mucus membrane lining the uterus which is evacuated with the placenta at the time of delivery. The placental membranes which evolve during pregnancy are composed of 3 parts: the ovular or reflected membrane covers the embryo and separates it from the uterine wall; the placental membrane separates the embryo from the muscle at the site of implantation in the endometrium, the parietal membrane covers the rest of the uterine cavity.