![](/drem/stage20/labels/S25L.gif)
![artifact separation(s), cerebral aqueduct (mesencoel), intermediate zone, marginal zone, osteogenic layer, roof plate of mesencephalon, tectum of mesencephalon, ventricular zone](/drem/stage20/Z0/S25N.jpg)
![](/drem/rulerbg.png)
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Carnegie Embryo #462 | Location: 1-03-01
Keywords: artifact separation(s), cerebral aqueduct (mesencoel), intermediate zone, marginal zone, osteogenic layer, roof plate of mesencephalon, tectum of mesencephalon, ventricular zone
Source: The Virtual Human Embryo.