Many problems of the reproductive system can be corrected. A Medical Textbook and Photographic Atlas 2nd ed. Female marsupials have two lateral vaginas , which lead to separate uteri, but both open externally through the same orifice; a third canal, which is known as the median vagina, and can be transitory or permanent, is used for birth. February 24, at 5: If the egg does not embed in the wall of the uterus, a woman gets her period and the egg is flushed away. July 4, at During menstruation, the menstrual flow exits the body via the vagina.