Explore the different parts of the vagina with an interactive diagram. Two-thirds of vaginal cancers are caused by the human papillomavirus (HPV).Anatomy and function · Diagram · Conditions. Apr 17, - Barnhart KT, Izquierdo A, Pretorius ES, Shera DM, Shabbout M, Shaunik A. Baseline dimensions of the human vagina. Hum Reprod. Jun.