The Müllerian ducts are two ducts of the embryo which empty into the cloaca, and which in the female develop into the upper vagina, cervix, uterus and oviducts; in the male they disappear except for the vestigial vagina masculina and the appendix testis.
Patweathington: I found out more about Testicular feminization syndrome (TFS), Mullerian duct syndrome (MDS), Congenital Adrenal Hyperplasia (CAH) etc.