Most structures other than the cerebral cortex

• The more primitive parts of the brain phylogenetically

WordNet Word definitions in WordNet
n. the more primitive parts of the brain phylogenetically; most structures other than the cerebral cortex [syn: paleencephalon , palaeencephalon ]

Wikipedia Word definitions in Wikipedia
In the anatomy of animals , paleoencephalon refers to most regions in the brain that are not part of the neocortex or neoencephalon . The paleoencephalon is the phylogenetically oldest part of the animal brain. Paleoenchepheal areas of older species are ...

Wiktionary Word definitions in Wiktionary
n. The most ancient part of the brain.