What parts of the brain do all vertebrates have? of which department are the large hemispheres?

What parts of the brain do all vertebrates have? of which department are the large hemispheres? In which group of animals do they first appear?

The brain in all vertebrates has five sections: the anterior, intermediate, middle, cerebellum and medulla oblongata.
The cerebral hemispheres are derivatives of the forebrain, which first appeared in amphibians, but their cerebral cortex is very poorly developed and practically absent.



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