Page 67 - كتاب تمريض نسا الاكتروني

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Placenta development

The placenta begins to develop upon implantation of the blastocyst into the maternal

endometrium.

Blastocyst remains free in the uterine cavity for 3-4 days before implantation.

After implantation, this outer layer (trophoblast) is divided into three layers:

mesoderm, the cytotrophoblast, and syncytotrophoblast. These 3 layers will form the

chorion

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