Female human anatomy vagina. Vagina is a muscular conduit composed of mucous membrane, muscular layer and adventitia, which is rich in extensibility and connects uterus and external genitalia. It is the handover organ of women, and also the conduit for discharging menstruation and delivering fetus.

Vagina is a muscular conduit composed of mucous membrane, muscular layer and adventitia, which is rich in extensibility and connects uterus and external genitalia. It is the handover organ of women, and also the conduit for discharging menstruation and delivering fetus. The vagina is often in a collapsed state where the front and rear walls of the sky are in contact.