[Participation of hormones and regulating factors in implantation and development of the fetoplacental unit]. / Participación de hormonas y factores reguladores de la implantación y el desarrollo de la unidad fetoplacentaria.

Although the embryo has a genetic program of its own development in order that development and embryonic differentiation take place, as well as normal gestation, a series of coordinated interactions between embryo and the mother, should be established; which are mediated by chemical messengers, autocrine, paracrine and endocrine. In this study, hormonal participation and regulating factors of implantation, and the feto-placental unit development, are analyzed.