A few Days after Fertilization. (apex)
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The blastocyst forms around 5-6 days after fertilization. It is a structure that develops from the zygote and is characterized by the presence of an inner cell mass and an outer layer of cells.
Blastocyst
The product of fertilization in humans is a zygote, which undergoes cell division to form a blastocyst. The blastocyst then implants into the uterus and continues to grow and develop into an embryo.
A blastocyst typically has around 100-200 cells by day 5 after fertilization. These cells are organized into an outer layer called the trophectoderm that will eventually form the placenta, and an inner cell mass that will develop into the embryo.
Pre-embryonic development is associated with processes including fertilization, cleavage, and formation of the blastocyst. During this stage, the zygote undergoes division and differentiation to form the blastocyst that will later implant into the uterine wall for further development into an embryo.
an unfertilized egg