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Jawed vertebrates or gnathostomes include fishes, amphibians, reptiles, birds and mammals, and all possess a well-developed brain enclosed within the cranium. The basic plan of the brain remains similar in all groups, being differentiated into forebrain, midbrain and hindbrain, but there are marked differences in size, complexity and functional specialization which reflect their mode of life. A generalized diagram of the vertebrate brain shows the olfactory lobes, cerebral hemispheres, diencephalon, optic lobes, cerebellum and medulla oblongata arranged in an antero-posterior sequence. In fishes, the brain is relatively simple and elongated. The _________ ________ _______ _________ _______.
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