Which of the following is not a part of the uterus?

The vagina is not a part of the uterus; it is a separate structure within the female reproductive system. The uterus, or womb, consists of several parts: the fundus, which is the uppermost portion; the body, which is the main part of the uterus; and the cervix, which is the lower part that connects the uterus to the vagina. While the vagina and uterus are closely related and work together as part of the reproductive system, the vagina itself is not an anatomical component of the uterus. Understanding these distinctions is essential for a clear comprehension of female reproductive anatomy in the context of medical administration.