What term refers to the opening of the cervical canal into the vagina?

• A. Urinary frequency
• B. Os
• C. Pelvic pain
• D. Perineum

Answer: (B)

The opening of the cervical canal into the vagina is called the external os. In gynecologic anatomy, the cervix has two openings: the internal os toward the uterus and the external os toward the vagina. The term os denotes an opening or orifice, so this short form is used to name that specific opening. The other terms refer to symptoms or regions (urinary frequency, pelvic pain, perineum) and do not describe the cervical opening.