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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]
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