Vagina

The vagina is a muscular passage which forms a part of the female sex organs and which connects the neck of the uterus (called the cervix) with the external genitals. The vagina, which is approximately two and one-half to four inches long, has muscular walls that are supplied with numerous blood vessels. These walls become erect when a woman is aroused as extra blood is pumped into these vessels. The vagina has three functions: as a receptacle for the penis during sexual intercourse; as an...