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The cervix

The cervix


The cervix is the neck or opening to the uterus. It is approximately 2.5cm long and extends down into the vagina at a slight angle, pointing towards the back of the vagina (posteriorly behind the baby's head) until labour or prelabour starts. With contractions the cervix starts to move towards the centre or front of the woman's vagina as it thins and dilates or opens.

A woman's cervix changes in subtle ways during her menstrual cycle as well as during pregnancy. As the pregnancy progresses, the cervical tissue becomes very glandular, producing a mass of thick mucus that plugs the cervical canal called a mucus plug or 'show'. This seals the uterus from outside infection. The show often comes away, mixed with a little blood during late pregnancy or during labour.

The cervix Image 1-08   shows the cervix of a pregnant woman.

Each individual woman's cervix can have small noticeable changes during pregnancy. For some women their cervix remains very closed, for others it can be slightly dilated (admitting a finger) but still remain quite thick. These changes are normal as it is only when the cervix thins out before dilating significantly that it indicates labour is starting.

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