GUSTOIMAGES / SCIENCE PHOTO LIBRARY GUSTOIMAGES / SCIENCE PHOTO LIBRARY
Upside down anatomical model of the human brain with the lower part removed to reveal the limbic system (centre) and brainstem (top). The limbic system is a primitive part of the brain involved in emotions, learning and the formation of memories. The brainstem controls automatic functions, sleep and arousal and relays messages from the brain to the spinal cord.
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