The engagement of the foetal head in the uterus when the vertex presents.
D000653:Amniotic Fluid; D001696:Biomechanical Phenomena; D002584:Cervix Uteri / Q000502:physiology*; D004106:Dilatation; D005321:Extraembryonic Membranes; D005260:Female; D005333:Fetus / Q000502:physiology; D006257:Head; D006801:Humans; D007231:Infant, Newborn; D007746:Labor Presentation; D007743:Labor, Obstetric; D008722:Methods; D008954:Models, Biological; D010298:Parity; D011247:Pregnancy; D011312:Pressure; D014599:Uterus / Q000502:physiology