What structure connects the uterus to the vagina?

The cervix is the correct structure that connects the uterus to the vagina. It serves as a passageway for menstrual flow to exit the body and as a canal through which sperm can enter the uterus. During childbirth, the cervix also plays a critical role by dilating to allow for the passage of the baby from the uterus into the birth canal. Its anatomical position at the lower part of the uterus means it acts as a bridge between these two important female reproductive organs, making it essential for both reproductive and birthing processes.

In contrast, the fundus is the upper part of the uterus and does not have a connecting role to the vagina. The isthmus refers to the narrower portion of the uterus, primarily the area just above the cervix, and does not serve as a direct connection to the vagina. The perineum is the region between the vagina (or scrotum in males) and the anus; while it is involved in the support of the pelvic organs, it does not act as a connection between the uterus and vagina.