What is the normal site of implantation of blastocyst?

What is the normal site of implantation of blastocyst?

1-Functional layer of endometrium

2-Basal layer of endometrium

The purpose of the functional layer is to prepare for the implantation of the blastocyst; it is the site of proliferation, secretion, and degeneration.

The purpose of the basal layer is to provide the regenerative endometrium after menstrual loss.

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