Defects of various kinds are met with both in the. internal and external parts. The ovaries may be wanting or may remain rudimentary. The uterus may be wanting, and with it the Fallopian tubes; or it may be quite rudimentary (Fig. 446), presenting perhaps a solid rudiment, or merely two diverging horns. With this the vagina is often defective. Then the uterus may retain in the adult the foetal or infantile form. Again, the uterus or vagina may be imperforate, or the hymen imperforate. There are also various defects of the external organs, as absence of the vulva, the vagina and urethra opening by a small aperture in the region which the vulva should occupy. The hymen may be absent, or it may present fimbriated processes sometimes so large as to project externally.
Fig. 446. - Rudimentary uterus. (Graily Hewitt from Kussmaul).
The Uterus unicornis occurs when one Miiller's duct is ill-developed. The uterus is a long thin structure which curves to one side, while the other horn is absent or rudimentary (Fig. 447).
Fig. 447. - Uterus unicornis. The parts are viewed from behind, and the distended bladder occupies the background. The right horn is large, and runs into the Fallopian tube whose fimbriated extremity is shown. There is no proper left horn, the Fallopian tube and round ligament springing from the base of the right horn. (Graily Hewitt from Kussmaul).