The role of the uterine isthmus in cervical incompetence.
D002584:Cervix Uteri / Q000502:physiology*; D005260:Female; D006801:Humans; D011247:Pregnancy; D002581:Uterine Cervical Incompetence; D014599:Uterus / Q000502:physiology*
CERVIX UTERI/physiology; UTERUS/physiology