The cervical os is the small opening at each end of the cervix. During ovulation, the cervical os opens to let sperm enter the uterus. Cervical stenosis is when the cervical os becomes too narrow or ...

Dilation and effacement are your body's way of getting ready for labor – your cervix gradually opens (dilates) and thins out (effaces) to help your baby make that grand entrance. This process can ...