ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Brain scan superimposed on a contour map of the human head. The green wire-frame head (side view) is seen partially from behind. The colour-coded brain scan, of the type obtained by magnetic resonance imaging (MRI), shows the brain sliced through vertically. Extensive convolutions (folds) of the cerebrum (red) are at top. The cerebrum is the largest and most developed part of the brain, responsible for conscious thought & memory. Behind it, at ear level, is the folded cerebellum (blue) concerned with balance, posture and coordination. The brainstem (yellow, centre), which is a thick- ening of the spinal cord, controls involuntary actions such as breathing and eye reflexes.
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