![](/drem/stage16/labels2/S81L.gif)
![alar plate of myelencephalon, artifact separation(s), head mesenchyme, intermediate zone, isthmus of rhombencephalon, mesencoel, rhombencoel (fourth ventricle), roof plate of rhombencephalon, trochlear nerve (CN IV), ventricular zone](/drem/stage16/Z0/S81N.jpg)
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Carnegie Embryo #6517 | Location: 4-02-03
Keywords: alar plate of myelencephalon, artifact separation(s), head mesenchyme, intermediate zone, isthmus of rhombencephalon, mesencoel, rhombencoel (fourth ventricle), roof plate of rhombencephalon, trochlear nerve (CN IV), ventricular zone
Source: The Virtual Human Embryo.