<prompt> Which will not come between cytotrophoblast and maternal blood?Decidua parietalisSyncytiotrophoblastInter villous spaceBasement membrane  <response>: Ans: a Decidua parietalis Ref: Dutta, 6th ed, 31As seen clearly from the diagram, the decidua parietalis is situated away from the attatchment of the embryo and thus cannot come between the maternal blood and cytotrophoblast. 