ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Brain scan. Coloured magnetic resonance imaging (MRI) scan of an axial (horizontal) section through a healthy brain. The front of the brain is at top. The two dark blue spheres are the eyes, with the nose in between them. Seen here is the cerebrum, the largest part of the brain. It is divided into two cerebral hemispheres and is responsible for conscious thought, emotion and voluntary movement.
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