![](/drem/stage22/labels/S2129L.gif)
![caudal mesenchyme, central canal, intermediate zone, marginal zone, osteogenic layer, subarachnoid space, surface ectoderm, terminal ventricle of central canal, ventricular zone](/drem/stage22/Z0/S2129N.jpg)
![](/drem/rulerbg.png)
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Boyd Embryo #H983 | Location: 197-1-1
Keywords: caudal mesenchyme, central canal, intermediate zone, marginal zone, osteogenic layer, subarachnoid space, surface ectoderm, terminal ventricle of central canal, ventricular zone
Source: The Virtual Human Embryo.