[New findings on the embryogenesis of the vagina].

The authors have studied a series of twelve embryos between 4 and 8 weeks of age and 21 fetuses between 9 and 25 weeks of gestation. From this material they have made a study of the embryogenesis of the vagina, which shows that the whole of the vagina, and not only the lower third or fifth, is derived from the vaginal plate, this latter is the result of proliferation and fusion of the two sino-vaginal bulbs. This study supports the unitary theory ascribing formation of the vagina to ascension and extension of the vaginal plate which is derived from the cloacal sinus.