![](/drem/stage20/labels2/S43L.gif)
![artifact separation(s), cerebral aqueduct (mesocoele), commissure of superior colliculus, intermediate zone, junction of mesencephalon and metencephalon, marginal zone, rhombencoel (fourth ventricle), root of trochlear nerve (CN IV), subarachnoid space, vascular plexus, ventricular zone](/drem/stage20/Z0/S43N.jpg)
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Carnegie Embryo #462 | Location: 1-02-03
Keywords: artifact separation(s), cerebral aqueduct (mesocoele), commissure of superior colliculus, intermediate zone, junction of mesencephalon and metencephalon, marginal zone, rhombencoel (fourth ventricle), root of trochlear nerve (CN IV), subarachnoid space, vascular plexus, ventricular zone
Source: The Virtual Human Embryo.