The fossa of vestibule of vagina (or fossa navicularis) is a boat-shaped depression between the vaginal opening/hymen and the frenulum labiorum pudendi within the vestibule. The small openings of the Bartholin's ducts can be seen in the grooves between the hymen and the labia minora, on either side.
Additional images
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Fossa of vestibule of vagina. Deep dissection.
References
This article incorporates text in the public domain from page 1323 of the 20th edition of Gray's Anatomy (1918)
