![](/drem/stage18/labels2/S210L.gif)
![alar plate(s), basal plate, decussation, marginal ridge, oculomotor nerve (CN III), rhombencoel (fourth ventricle), roof plate, subarachnoid space, sulcus limitans, trochlear nerve (CN IV)](/drem/stage18/Z0/S210N.jpg)
![](/drem/rulerbg.png)
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Carnegie Embryo #4430 | Location: 7-20
Keywords: alar plate(s), basal plate, decussation, marginal ridge, oculomotor nerve (CN III), rhombencoel (fourth ventricle), roof plate, subarachnoid space, sulcus limitans, trochlear nerve (CN IV)
Source: The Virtual Human Embryo.