The cervix is the cylindrical mouth of the uterus, separating it from the vagina. Normally, earlthe cervix is at least 3-4 cm long, and its length in pregnancy strengthens the protection of the fetus.
Understanding Incompetent Cervix During Early Labor
Cerclage may reduce the risk of premature labor in some twin pregnancies, Your Pregnancy Matters
PDF] Prediction of Preterm Delivery by Ultrasound Measurement of Cervical Length and Funneling Changes of the Cervix in Pregnant Women with Preterm Labor at 28-34 weeks of Gestation
Vaginal progesterone to prevent preterm birth in pregnant women with a sonographic short cervix: clinical and public health implications - ScienceDirect
Pessary Delays Births In Mothers at Risk of Premature Delivery - The New York Times
Risk Factors for Preterm Birth: Risk of Premature birth
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Cerclage may reduce the risk of premature labor in some twin pregnancies, Your Pregnancy Matters
Should I have a transvaginal ultrasound to measure cervical length and help prevent preterm delivery?, Your Pregnancy Matters
Treatment to prevent a premature birth
An explanation of risk factors of preterm labor - Sanford Health News