The brain is an organ that serves as the center of the nervous system in all vertebrate and most invertebrate animals—only a few invertebrates such as sponges, jellyfish, adult sea squirts and starfish do not have a brain, even if diffuse neural tissue is present. It is located in the head, usually close to the primary sensory organs for such senses as vision, hearing, balance, taste, and smell.
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abstract anatomy background biology blue body brain cell cerebellum cerebral concentration concept head health human illustration impulse inside intelligence medical medicine mind nerve nervous network neural neurology neuron organ physiology ray scan science skull synapse system tissue transparent white wisdom
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