![](/drem/stage21/labels/S387L.gif)
![edge of central canal, mesenchyme, osteogenic layer, roof plate, surface ectoderm](/drem/stage21/Z0/S387N.jpg)
![](/drem/rulerbg.png)
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Carnegie Embryo #4090 | Location: 24-27
Keywords: edge of central canal, mesenchyme, osteogenic layer, roof plate, surface ectoderm
Source: The Virtual Human Embryo.
Keywords: edge of central canal, mesenchyme, osteogenic layer, roof plate, surface ectoderm
Source: The Virtual Human Embryo.