![](/drem/stage20/labels2/S57L.gif)
![alar plate(s), artifact separation(s), basal plate, cerebral peduncle, floor plate, interpeduncular fossa, interpeduncular nucleus, roof of rhombencoel (fourth ventricle), roof plate of mesencephalon, subarachnoid space, sulcus limitans, tectum, tegmentum, trochlear nerve (CN IV)](/drem/stage20/Z0/S57N.jpg)
![](/drem/rulerbg.png)
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Carnegie Embryo #462 | Location: 1-03-05
Keywords: alar plate(s), artifact separation(s), basal plate, cerebral peduncle, floor plate, interpeduncular fossa, interpeduncular nucleus, roof of rhombencoel (fourth ventricle), roof plate of mesencephalon, subarachnoid space, sulcus limitans, tectum, tegmentum, trochlear nerve (CN IV)
Source: The Virtual Human Embryo.