[Morphogenesis of the tubo-uterine junction in the human fetus].

The utero-tubal junction morphology has been analysed by means of the uterus and tubes study of 37 human foetuses and new-born infants between the 15th gestational week and the 3rd life week. Being difficult to identify it before the 20th gestational week, it is possible to recognize the uterotubal junction by the muscular fibers traject, as well as by the arrangement of the reticuline fibers and mesenchymal cells of the submucosa. During the previously reported period we haven't observed any sphincterian structure at the utero-tubal junction level; thus, we believe that the closure mechanism is purely functional one.