![](/drem/stage16/labels2/S37L.gif)
![external space, head mesenchyme, intermediate zone, primordial meninx, rhombencoel (fourth ventricle), roof plate, ventricular zone](/drem/stage16/Z0/S37N.jpg)
![](/drem/rulerbg.png)
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Carnegie Embryo #6517 | Location: 2-03-01
Keywords: external space, head mesenchyme, intermediate zone, primordial meninx, rhombencoel (fourth ventricle), roof plate, ventricular zone
Source: The Virtual Human Embryo.
Keywords: external space, head mesenchyme, intermediate zone, primordial meninx, rhombencoel (fourth ventricle), roof plate, ventricular zone
Source: The Virtual Human Embryo.