Keywords:
cerebral vesicle (telencephalon),
diencephalon,
isthmus,
lens vesicle,
mamillary region,
mesencephalon (midbrain),
metencephalon,
myelencephalon,
optic cup,
pons region (metencephalon),
pontine flexure region,
roof of rhombencoel (fourth ventricle) (collapsed),
telencephalon
Source: The Virtual Human Embryo.