![](/drem/stage20/labels2/S49L.gif)
![artifact separation(s), cerebral aqueduct (mesocoele), intermediate zone, marginal zone, rhombencoel (fourth ventricle), subarachnoid space, vascular plexus, ventricular zone](/drem/stage20/Z0/S49N.jpg)
![](/drem/rulerbg.png)
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Carnegie Embryo #462 | Location: 1-04-03
Keywords: artifact separation(s), cerebral aqueduct (mesocoele), intermediate zone, marginal zone, rhombencoel (fourth ventricle), subarachnoid space, vascular plexus, ventricular zone
Source: The Virtual Human Embryo.