ROGER HARRIS / SCIENCE PHOTO LIBRARY ROGER HARRIS / SCIENCE PHOTO LIBRARY
Midbrain in the brain. Computer artwork of a person's head showing the left hemisphere of the brain inside. The highlighted area shows the midbrain. The midbrain, or mesencephalon, is part of the brainstem. It is the smallest region of the brain and acts as a relay station for auditory and visual information. It controls many important functions including the visual and auditory systems, and eye movement. The substantia nigra in the midbrain contains a large number of dopamine-producing neurons, the degeneration of which is associated with Parkinson s disease.
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