![](/drem/stage18/labels2/S64L.gif)
![commissure, intermediate zone, junction of mesencephalon and metencephalon, marginal zone, roof plate, roof plate of mesencephalon (M2), root of trochlear nerve (CN IV), subarachnoid space, surface ectoderm, ventricular zone](/drem/stage18/Z0/S64N.jpg)
![](/drem/rulerbg.png)
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Carnegie Embryo #4430 | Location: 2-26
Keywords: commissure, intermediate zone, junction of mesencephalon and metencephalon, marginal zone, roof plate, roof plate of mesencephalon (M2), root of trochlear nerve (CN IV), subarachnoid space, surface ectoderm, ventricular zone
Source: The Virtual Human Embryo.