Nidation

The nidation consists for the Embryon, at the Mammifère S Placentaire S, to be established in the uterine Muqueuse. This nidation will make it possible the embryo to develop its Placenta in company of the uterine mucous membrane of his/her mother. There will remain thus fixed at the body of the latter for all the period of Gestation. At the human , this nidation takes place approximately six days after the Fécondation.

Fixing with the endometer

The embryo, also called Blastocyste, approaches the uterine mucous membrane by its embryonic pole. the cells of the Trophoblaste then will proliferate actively and undergo several Mitose S in order to be different in Syncytiotrophoblaste and Cytotrophoblaste.

Invasion of the endometer

The syncytiotrophoblaste continues to proliferate: it returns in the fast Endomètre in way and secretes Enzymes, which little by little will destroy fabric of the Endomètre. At the end of the 9th day, the egg penetrated in entirety, and the roadbases of the uterine mucous membrane will be stopped by a stopper of Fibrine.

The syncytiotrophoblaste surrounds finally the whole blastocyste.

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