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Embryo development after fertilization
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Embryo development after fertilization

One of the most important steps in any in vitro fertilization process is to evaluate the embryonic development after the fusion of the egg and the sperm.

The embryologist will check if the fertilization has been successful 16 to 20 hours after the insemination of the egg. To do this, he will look for the presence of the two polar corpuscles (PC) and the two pronuclei (PN), which will fuse to give rise to the zygote (one-cell embryo).

As we can see in the image, the zygote is the first embryonic stage. When it reaches the blastocyst stage (day 5-6), implantation occurs and, with it, a new pregnancy begins.

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Last Update: 02/18/2022