![](/drem/stage17/labels2/S93L.gif)
![isthmus, mesencephalon (M2), metencephalon, rhombencoel (fourth ventricle), roof plate, roof plate of myelencephalon, root of accessory nerve (CN XI), sulcus limitans](/drem/stage17/Z0/S93N.jpg)
![](/drem/rulerbg.png)
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Carnegie Embryo #6520 | Location: 3-03-01
Keywords: isthmus, mesencephalon (M2), metencephalon, rhombencoel (fourth ventricle), roof plate, roof plate of myelencephalon, root of accessory nerve (CN XI), sulcus limitans
Source: The Virtual Human Embryo.