![](/drem/stage16/labels2/S65L.gif)
![artifact separation(s), depression artifact, mesencephalon, mesencoel (cerebral aqueduct), rhombencoel (fourth ventricle), rhombic lip of metencephalon, roof plate, root of trochlear nerve (CN IV), tectum](/drem/stage16/Z0/S65N.jpg)
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Carnegie Embryo #6517 | Location: 3-03-05
Keywords: artifact separation(s), depression artifact, mesencephalon, mesencoel (cerebral aqueduct), rhombencoel (fourth ventricle), rhombic lip of metencephalon, roof plate, root of trochlear nerve (CN IV), tectum
Source: The Virtual Human Embryo.