The fetal membranes include amnion and chorion.
They are formed by folding of the amniotic cavity and extra embryonic coelom as shown in the model. We used to have PCB ( physics, chemistry and biology) as the subjects for our medical entrance examination. In the same manner, ;) , the uterine stroma gets organised into decidua such that they are in the order as seen in the model-PCB, ie, Parietalis, Capsularis and Basalis. XD.
The pictures shown are of models arranged in chronological order.
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