The lower, narrow end of the uterus that forms a canal between the uterus and vagina.
Source: NCI Dictionary of Cancer Terms
Caption: Anatomy of the female reproductive system. The organs in the female reproductive system include the uterus, ovaries, fallopian tubes, cervix, and vagina. The uterus has a muscular outer layer called the myometrium and an inner lining called the endometrium.Date last modified: 2009-08-28