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Healthy brain. Coloured Magnetic Resonance Image (MRI) scans through the human head, showing the brain in horinzontal (axial) section. There are 21 scans, taken from the top of the head (top left) down to the level of the teeth (lower right). At top are the two celebral hemispheres of the brain, consisting of white matter (light green) and grey matter (dark green). At middle, the face is seen with rounded eyeballs and nasal cavity. At bottom is the cerebellum of the brain which lies beneath the cerebrum, at the level of upper toothrow. MRI scanning creates 'slice' images through the body, useful in detecting brain tumours and cancer. (KEYSTONE/SCIENCE PHOTO LIBRARY/WELLCOME DEPT. OF COGNITIVE NEUROLOGY/STR) === ===