You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Which will not come between cytotrophoblast and maternal blood? and explain in detail?
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.