Brain scan. Coloured Magnetic Resonance Imaging (MRI) scan through a human head, showing a healthy brain in side view. The face is seen in profile at left. Tissues of the mouth, nasal cavity, and central nervous system are visible. The folded cerebrum of the brain (at top) makes up the larger part of the brain; intelligent thought processes, memory and conscious movement are processed in the cerebrum. At centre (blue) is the elongated brainstem which controls involuntary reflexes like breathing and eye reflexes; it connects with the spinal cord. To the right of the brainstem is the cerebellum which is involved in body posture, balance and the coordination of movement.