![](/drem/stage18/labels/S827L.gif)
![alar plate(s), edge of central canal, intermediate zone, marginal zone, oblique section through surface ectoderm, roof plate, subarachnoid space, vascular plexus, ventricular zone](/drem/stage18/Z0/S827N.jpg)
![](/drem/rulerbg.png)
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Carnegie Embryo #4430 | Location: 29-9
Keywords: alar plate(s), edge of central canal, intermediate zone, marginal zone, oblique section through surface ectoderm, roof plate, subarachnoid space, vascular plexus, ventricular zone
Source: The Virtual Human Embryo.