First Week of Development

First Week of Development PPT Summary

1. Fertilization occurs in the ampullary region of the uterine tube, where sperm must undergo capacitation before they can fertilize the oocyte.
2. The journey of sperm from the cervix to the site of fertilization can take from 30 minutes to 6 days, and only 300 to 500 sperm typically reach the oocyte.
3. The acrosome reaction is critical for sperm to penetrate the zona pellucida, facilitated by enzymes released upon binding to zona proteins.
4. Cleavage begins once the zygote is formed, leading to the development of a morula and subsequently a blastocyst.
5. The blastocyst consists of two distinct cell masses: the embryoblast, which will develop into the embryo, and the trophoblast, which will contribute to the placenta.

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