[Influence of tubal and uterine milieu in the embryonic development]

Establishment of pregnancy in mammals is a process resulting of closely concerted events. The participation of the embryo through its development and secretory activity on the one hand, and on the other, the oviductal and endometrial tissues, by means of their secretions, give the optimal conditions to let the embryo establish creating a proper milieu for its nutrition and development. In this review, we analyze the influence of the oviductal and uterine secretions upon early embryonic development and differentiation and some transport systems of nutritional elements required in the early stages of the blastogenesis.