PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY
Brain. Model of a section through a healthy human brain. The front of the brain is at left. The largest part of the brain is the forebrain which mainly comprises the folded cerebrum which controls conscious activity, sensation and thought. The rod-like brainstem (white, at the base of the brain) relays signals to and from the brain through the spinal cord. At the back of the brain (to the right of the brainstem) is the cerebellum which is responsible for posture, balance and the coordination of movement. The rest of the forebrain (white) includes the large curved corpus callosum (above the brainstem), a band of tissue connecting the brain's two hemispheres.
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