External orifice of the uterus External orifice of the uterus External orifice of the uterus External orifice of the uterus External orifice of the uterus External orifice of the uterus External orifice of the uterus English External orifice of the uterus External orifice of the uterus External orifice of the uterus External orifice of the uterus External orifice of the uterus External orifice of the uterus External orifice of the uterus External orifice of the uterus External orifice of the uterus External orifice of the uterus External orifice of the uterus External orifice of the uterus External orifice of the uterus External orifice External orifice of the uterus External orifice of the uterus External orifice of the uterus External orifice of the uterus External orifice of the uterus External orifice of the uterus External orifice of the uterus External orifice of the uterus External orifice of the uterus External orifice of the uterus External orifice of the uterus cervical os External orifice of the uterus External orifice of the uterus External orifice of the uterus External orifice of the uterus External orifice of the uterus External orifice of the uterus External orifice of the uterus External orifice of the uterus External orifice External orifice of the uterus External orifice of the uterus External orifice of the uterus External orifice of the uterus External orifice of the uterus