title: The three lines: origin of sonographic landmarks of the fetal head.
authors.forename: L C
authors.initials: LC
authors.lastname: de Crespigny
authors.forename: H P
authors.initials: HP
authors.lastname: Robinson
mesh_terms: D002536:Cerebral Arteries / Q000196:embryology*; D002550:Cerebral Veins / Q000196:embryology*; D005333:Fetus / Q000033:anatomy & histology*; D006801:Humans; D014463:Ultrasonography