palaeencephalon
Noun: - The more primitive parts of the brain phylogenetically; most structures other than the cerebral cortex: The palaeencephalon refers to the evolutionarily older structures of the brain, primarily comprising the brainstem, cerebellum, and basal ganglia, which are responsible for basic, automatic functions.
The term is used in specialized academic contexts, particularly in comparative neuroanatomy and evolutionary biology, to describe and contrast ancient brain structures with the more recently evolved neocortex. - The study focused on the functions of the palaeencephalon in regulating vital autonomic processes. - In evolutionary terms, the palaeencephalon develops earlier than the cerebral cortex.
- In evolutionary neuroscience: The concept is used to discuss the layered or "triune brain" model, where the palaeencephalon represents the foundational layer upon which newer structures were built.
- The model posits that the palaeencephalon governs instinctual behaviors shared with reptiles.
- Paleencephalon (noun): An alternative spelling, primarily used in American English.
- Archipallium (noun): A related, though not perfectly synonymous, term sometimes used for phylogenetically old cortical structures.
- Brainstem (noun): A major component of the palaeencephalon.
- Cerebellum (noun): A major component of the palaeencephalon.
- Ancient brain
- Reptilian complex (in the triune brain model)
- Subcortical structures (in a broad functional context, though this is a descriptive synonym, not a perfect anatomical one)
- Neocortex
- Neencephalon (the phylogenetically newer parts of the brain, especially the cerebral cortex)
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the more primitive parts of the brain phylogenetically; most structures other than the cerebral cortex
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