Our cervix plush is so adorable you'll want to bring it to your next pap smear! Booklet hangtag describes this incredible wizard of os. Measures 4.5" tall x 7.5" wide x 7.5" thick, comes with a booklet hangtag describes this incredible wizard of os. The cervix looks like a cute little donut that connects the uterus to the vagina. During menstruation, the cervix opens to allow blood to pass from the uterus to the vagina. During ovulation, the cervix opens slightly, allowing sperm -- if any's around -- through to the uterus. And during childbirth, the cervix opens super-duper wide to let a whole baby go from the uterus through the vagina and out into the world. Wow!