![](/drem/stage22/labels/S109L.gif)
![artifact(s), cerebral aqueduct (mesocoele), head mesenchyme, mesencephalon, osteogenic layer, roof plate, subarachnoid space, surface ectoderm](/drem/stage22/Z0/S109N.jpg)
![](/drem/rulerbg.png)
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Boyd Embryo #H983 | Location: 10-1-1
Keywords: artifact(s), cerebral aqueduct (mesocoele), head mesenchyme, mesencephalon, osteogenic layer, roof plate, subarachnoid space, surface ectoderm
Source: The Virtual Human Embryo.