![](/drem/stage20/labels2/S41L.gif)
![artifact separation(s), commissure of superior colliculus, mesencephalon, metencephalon, osteogenic layer, roof of rhombencoel (fourth ventricle), root of trochlear nerve (CN IV), tectum, tegmentum](/drem/stage20/Z0/S41N.jpg)
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Carnegie Embryo #462 | Location: 1-01-01
Keywords: artifact separation(s), commissure of superior colliculus, mesencephalon, metencephalon, osteogenic layer, roof of rhombencoel (fourth ventricle), root of trochlear nerve (CN IV), tectum, tegmentum
Source: The Virtual Human Embryo.