ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Coloured Magnetic Resonance Imaging (MRI) scan in axial section through the brain of a 65 year old patient, showing Parkinson's disease. At centre are a number of plaques (dark areas) in the thalamus close to the basal ganglia. Parkinson's disease is caused by loss of nerve cells in the basal ganglia resulting in jerky, involuntary movements.
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