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Healthy brain, magnetic resonance imaging (MRI) scan. The front of the head is at top. This is a view at the level of the eyes (dark areas at top). At centre are the pons, part of the brainstem that are involved in the control of sleep and arousal. Just below this is the cerebellum, which controls balance, posture and muscle coordination. Surrounding them is the cerebrum, which is responsible for conscious thought, emotion and voluntary movement. For a series of slices through this brain see F036/5751 to F036/5762.