title: [The opening and closing mechanisms in the cervical isthmus segment].
mesh_terms: D005260:Female; D006801:Humans; D007743:Labor, Obstetric / Q000502:physiology*; D009333:Neck; D011247:Pregnancy; D014599:Uterus / Q000502:physiology*; D014937:Work
keywords: LABOR/physiology; UTERUS/physiology