cervix
The cervix is a neck of tissue that connects the vaginal canal and the uterus (which the cervix acts as an orifice to). The cervix appears as a plump, circular, "doughnut" at the back of the vagina visible when the vaginal opening of the vulva is spread wide open, however it is often hard to make out without proper lighting, and/or the use of a speculum.
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The following tags implicate this tag: multi_cervix, prolapsed_cervix (learn more).