![](/drem/stage23/labels2/S4L.gif)
![dural limiting membrane, edge of cerebral aqueduct, osteogenic layer, roof plate of mesencephalon, subarachnoid space, subcutaneous vascular plexus, surface ectoderm](/drem/stage23/Z0/S4N.jpg)
![](/drem/rulerbg.png)
0 μm
Carnegie Embryo #9226 | Location: 4-01-01
Keywords: dural limiting membrane, edge of cerebral aqueduct, osteogenic layer, roof plate of mesencephalon, subarachnoid space, subcutaneous vascular plexus, surface ectoderm
Source: The Virtual Human Embryo.