Figure 12b. Embryologic development of the uterus and vagina. (a) Diagrams show that both müllerian ducts (red area) fuse on the midline to form the uterus. The proximal part of the duct gives rise to the fallopian tube. The wolffian ducts (green areas) regress. The distal remnant of the wolffian duct forms the Gartner duct. (b) Diagrams show that the uterovaginal canal (red area) reaches the urogenital sinus (pink area) (1). The vaginal plate develops (2), proliferates (3), and undergoes canalization (4). The vagina is formed by both the müllerian ducts and the urogenital sinus (5).