Final answer:
The narrow passage from the uterine cavity to the vagina is called the cervical canal. The cervix is the neck of the uterus that protrudes into the vagina. It contains a canal that connects the vagina and uterus, allowing for the passage of sperm or an infant during birth.
Step-by-step explanation:
The narrow passage from the uterine cavity to the vagina is called the cervical canal. The cervix is the neck of the uterus that protrudes into the vagina. It contains a canal that connects the vagina and uterus, allowing for the passage of sperm or an infant during birth.