![](/drem/stage20/labels2/S47L.gif)
![artifact separation(s), cerebral aqueduct (mesencoel), isthmus of metencephalon, rhombencoel (fourth ventricle), roof of rhombencoel (fourth ventricle), subarachnoid space, sulcus limitans, tectum, tegmentum, vascular plexus](/drem/stage20/Z0/S47N.jpg)
![](/drem/rulerbg.png)
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Carnegie Embryo #462 | Location: 1-03-05
Keywords: artifact separation(s), cerebral aqueduct (mesencoel), isthmus of metencephalon, rhombencoel (fourth ventricle), roof of rhombencoel (fourth ventricle), subarachnoid space, sulcus limitans, tectum, tegmentum, vascular plexus
Source: The Virtual Human Embryo.