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Section through human head showing the brain. The largest part of the brain is the forebrain (top, brown) which mainly comprises the folded cerebrum where conscious brain activity takes place. The rod-like brainstem (white, centre) relays signals to and from the brain through the spinal cord (white, bottom). To the right of the brainstem is the cerebellum, which is responsible for posture, balance and co-ordination of movement. Above the brainstem is the curved corpus callosum, a band of tissue that connects the brain's two hemispheres. The eye socket, nose and nasal passages, and mouth can be seen on the far right.
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