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Cervical Os


Updated June 25, 2014

Birthing centre. Pregnant woman during early labour at a birthing centre.
Ian Hooton/Science Photo Library/Brand X Pictures/Getty Images
Definition: The opening of the cervix. There are both external and internal os in the cervix, like a funnel.

This opening to the uterus opens for ovulation to allow sperm to enter. It also is what effaces and dilates in labor and delivery to allow for the birth of the baby.

Also Known As: opening of the cervix
Common Misspellings: cervical oz
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