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For implantation to take place the uterus must become receptive. Uterine receptivity involves much cross-talk between the embryo and the uterus, initiating changes to the endometrium. This stage gives a synchrony that opens a window of implantation that enables successful implantation of a viable embryo. [4]
The germinal stage refers to the time from fertilization through the development of the early embryo until implantation is completed in the uterus. The germinal stage takes around 10 days. [1] During this stage, the zygote divides in a process called cleavage. A blastocyst is then formed and implants in the uterus.
"Implantation is the beginning of the development of the placenta and embryo as the fertilized egg burrows into the thickened lining of the uterus to establish a ... How long does implantation last?
The embryo hatches from its protein shell (zona pellucida) and performs implantation onto the endometrial lining of the mother's uterus. (day 5–6 of fertilization. [1]) If separation into identical twins occurs, 1/3 of the time it will happen before day 5. [2]
The embryo becomes embedded in the endometrium in a process called implantation. In most successful pregnancies, the embryo implants 8 to 10 days after ovulation. [7] The embryo, the extra-embryonic membranes, and the placenta are collectively referred to as a conceptus, or the "products of conception".
Before implanting into the uterine wall the embryo is sometimes known as the pre-implantation embryo or pre-implantation conceptus. [10] Sometimes this is called the pre-embryo a term employed to differentiate from an embryo proper in relation to embryonic stem cell discourses. [11]
Ashleigh Sunderlin (right) and her surrogate Julianne Richardson (left) joining hands earlier this year during an embryo implant procedure. Sunderlin, a Grand Ledge High School graduate, searched ...
The embryo, meanwhile, proliferates and develops both into embryonic and extra-embryonic tissue, the latter forming the fetal membranes and the placenta. In humans, the embryo is referred to as a fetus in the later stages of prenatal development. The transition from embryo to fetus is arbitrarily defined as occurring 8 weeks after fertilization.