Gynaecology & Obstetrics True about vagina development is all except A Mucous membrane of vagina is derived from endoderm of urogenital sinus. B Hymen is remnant of sinovaginal bulb. C Upper 1/3 rd of vagina is derived from mullerian ducts. D Lower 1/3rd of vagina is derived from urogenital sinus. 💡 Explanation True about vagina development is all except ✓ Correct Answer: C. Upper 1/3 rd of vagina is derived from mullerian ducts.