- Large (113 Kb)- Scroll down to informationWithout labelsLegend:1 amnion2 metencephalic region3 mesencephalon4 optic cup + lens5 prosencephalon6 auditory vesicle7 branchial arches8 atrium9 ventricle10 lateral fold11 lateral mesoderm12 vitelline artery / vein13 somite14 neural tube15 caudal fold