Lower 1/3 of vagina is formed by

Lower 2/3rd of vagina formed from sinovaginal bulb which comes from endoderm of urogenital sinus. Upper 1/3rd of vagina is derived from fused paramesonephric duct. Mesonephric duct forms the collecting pa or ductular pa of male reproductive system. Mesoderm of Mullerian duct is basically paramesonephric duct.