Fertilization, Implantation, and Placentation

  • Bradley Bigelow


Fertilization of an ovum by sperm normally occurs in the distal part of the fallopian tube.14 Cell division and cleavage continue during the transit through the tube. Transit time takes approximately 4 days, a period considered essential in the development of the fertilized ovum in preparation for implantation in the uterus.14


Human Placenta Chorionic Villus Intervillous Space Placental Site Syncytiotrophoblast Cell 
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© Springer Science+Business Media New York 1977

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  • Bradley Bigelow

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