any functional anomaly of the fibromuscular tubular tract leading from the uterus to the exterior of the body; it serves as a passageway for cervical mucus, menstrual fluid and other secretions out of the body; during sexual intercourse, it receives the penis and ejaculate, assisting in its transport to the uterus; during the birth process, it expands to provide a channel for delivery of a newborn from the uterus