GEOFF TOMPKINSON / SCIENCE PHOTO LIBRARY GEOFF TOMPKINSON / SCIENCE PHOTO LIBRARY
Human brain. Computer artwork of a human brain in a head, with light coming from the eyes. The largest part of the brain is the cerebrum (upper left, convoluted). It controls conscious thoughts and actions. The cerebellum (red, centre left) controls balance and posture. The brainstem (red, running down to lower left) links the brain to the spinal cord. It also controls reflexes as well as unconscious actions such as breathing.
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