![](/drem/stage21/labels/S33L.gif)
![artifact space(s), cephalic edge of metencephalon, cerebral aqueduct (mesocoele), mesencephalon, osteogenic layer, subarachnoid space, surface ectoderm](/drem/stage21/Z0/S33N.jpg)
![](/drem/rulerbg.png)
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Carnegie Embryo #4090 | Location: 2-17
Keywords: artifact space(s), cephalic edge of metencephalon, cerebral aqueduct (mesocoele), mesencephalon, osteogenic layer, subarachnoid space, surface ectoderm
Source: The Virtual Human Embryo.