part_of starts_at ends_at female reproductive system vagina The vagina (TS:24-TS:28). The developing vagina is subdivided into upper vagina and sinovaginal bulb (or lower vagina), however only the upper vagina will become the vagina in the adult (Kurita 2010). The sinovaginal bulb is a transient structure only seen during development. The sinovaginal bulb is derived from the urogenital sinus epithelium (and is therefore often called the sinus vagina). The adult vagina (TS:28) is derived from the upper vagina (TS:24-TS:27), and is derived from the paramesonephric duct of female. EMAPA:18986 anatomical_structure TS24 TS28