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A developing human is referred to as an embryo during weeks 3–8, and a fetus from the ninth week of gestation until birth. In this section, we’ll cover the pre-embryonic and embryonic stages of development, which are characterized by cell division, migration, and differentiation.
What Are the Steps of Frozen Embryo Transfer? The embryos are transferred into the woman's uterus on a specified day of the menstrual cycle. This day is called the ' implantation window ' and it signifies the day when the uterus is most receptive to the embryo.
Implantation occurs 6 or 7 days after fertilization. During implantation and placentation, a human embryo must attach itself to the uterus under conditions of shear stress. The embryo is rolling about within a mucus rich environment between the opposing surfaces of the endometrial walls of the uterus.
In this article, we discuss various elements that may guide the timing of frozen embryo transfer, including the role of endometrial characteristics such as thickness, days postovulation or length of progesterone administration, stage of the embryo, and the application of endometrial receptivity tests to guide personalized embryo transfer.
13 mar 2020 · Two of the most critical steps in the establishment of human pregnancy are implantation and decidualization, which are required for maternal interactions with the developing embryo. This review primarily highlights the physiological aspects of these two events and the adverse pregnancy outcomes from defective implantation and decidualization.
9 maj 2006 · Frozen embryo transfers with embryos having four or more blastomeres were associated with markedly higher positive hCG, clinical pregnancy, implantation and delivery rates compared with frozen embryo transfers with embryos possessing fewer cells.
5 maj 2023 · Here, we examine the evolutionary context of embryo implantation and elaborate on uterine remodelling before and after conception in humans. We also discuss the interactions between the embryo and the decidualising endometrium that regulate interstitial implantation and determine embryo fitness.
