2. Insufficient Cervix Definition

The cervix is a band that protects against fetal loss. Located in the lower uterus, it is thick and fibrous, and along with mucous glands, helps create a protected and sterile environment for fetal development. An insufficient or weakened cervix dilates and thins before term; it is unable to bear the weight of the growing fetus without medical intervention.

cervix premature-birth newannyart / Getty Images

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