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.
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