![](/drem/stage23/labels/S12L.gif)
![cerebral aqueduct (mesocoele), dural limiting membrane, dural venous sinus, intermediate zone, marginal zone, mesencephalon (tectum), osteogenic layer, trabeculae in subarachnoid space, ventricular zone](/drem/stage23/Z0/S12N.jpg)
![](/drem/rulerbg.png)
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Carnegie Embryo #9226 | Location: 12-01-01
Keywords: cerebral aqueduct (mesocoele), dural limiting membrane, dural venous sinus, intermediate zone, marginal zone, mesencephalon (tectum), osteogenic layer, trabeculae in subarachnoid space, ventricular zone
Source: The Virtual Human Embryo.