Which of the following is not one of the phases of Implantation of Embryo?: (A) Epithelialization, (B) Apposition, (C) Adhesion, (D) Invasion
Answer is A. Implantation of Embryo can be divided into three phases: Apposition--initial contact of the blastocyst to the uterine wall Adhesion--increased physical contact between the blastocyst and decidua; and Invasion--penetration and invasion of syncytiotrophoblast and cytotrophoblast into decidua , inner third of the myometrium, and uterine vasculature.