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