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The sinovaginal bulb is a transitional structure in the development of female genitalia, and is one of a pair of endodermal outgrowths of the urogenital sinus, which later fuse to form the lower part of the vagina.[1][2] The lower third of the vagina is derived from the urogenital sinus.[3]

The hymen is formed from the same tissue as the sinovaginal bulb.[1]


  1. ^ a b "ohsu2015 - 10.5.11 - Embryology of the External Genitalia". Retrieved 2015-02-11.
  2. ^ "sinovaginal bulb". Retrieved 2015-02-11.
  3. ^ "Androgens and the Development of the Vagina". Retrieved 2015-02-11.