In placental mammals, the blastocyst normally implants within the

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In placental mammals, the blastocyst (early stage embryo) normally implants within the endometrium of the uterus, where it establishes the connection with the maternal blood supply and develops into a fetus. Implantation in other locations such as the oviducts, ovary or vagina would either be abnormal or impossible for normal embryonic development. The chorion is a membrane that develops from the outer layers of the embryo and is involved in the formation of the placenta, but it does not itself serve as the site of implantation.

In Placental Mammals, the Blastocyst Normally Implants Within the