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Fertilization takes place in the fallopian tube, more specifically the juncture of the ampulla and isthmus (ampullary-isthmic junction). The ovaries will ovulate and expel a mature ovum due to a surge in the Leutenizing Hormone. The fertilized ovum, a zygote, will then undergo rapid mitotic divisions, ie the 2-cell, 8-cell, and finally, morula, and blastocyst. It is this blastocyst that will differentiate its outer layer into a synytiotrophoblast layer that phagocytoses and penatrates the endometrium.

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14y ago

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