protocerebrum
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http://purl.obolibrary.org/obo/UBERON_6003627
The most anterior of the segmental subdivisions of the insect CNS; thought to represent the first pre-oral segment of the brain. The protocerebrum comprises many discrete neuropil regions including the central body complex and mushroom bodies. [ http://flybrain.neurobio.arizona.edu/Flybrain/html/terms/terms.html ]