SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Brain. Coloured engraving from 1880 of a medial cross section of a brain. The front of the brain is at right. The brain has three main parts: the cerebrum (pink & pale yellow), the cerebellum (brown, at lower left) and the brain stem (dark red, centre right). The brain stem is separated from the cerebrum by the Corpus callosum (light brown). The spinal cord is at bottom left. The cerebrum is responsible for intelligence, the cerebellum controls balance and the brain stem controls automatic responses and acts as a relay centre for nerve impulses. The different areas in the brain are connected by a complex system of nerve fibre bundles which vary in length.
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