ROGER HARRIS / SCIENCE PHOTO LIBRARY ROGER HARRIS / SCIENCE PHOTO LIBRARY
Brainstem. Computer artwork of a person's head showing the brain inside. The highlighted area shows the brainstem. The brainstem connects the brain to the spinal cord. It consists of the medulla oblongata, pons and midbrain. It controls automatic functions, sleep and arousal, and relays messages from the brain to the spinal cord.
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