Human brain. Side view of the anatomy of a healthy human brain, cut through to shows major regions. At top are extensive convolutions of the cerebrum (left cerebral hemisphere) where higher thought processes occur with the coordination of voluntary body activity. The cerebellum (lower left) is part of the hindbrain, convoluted with white nerve tracts within; it coordinates muscle movement. At centre (white) are corpus callosum nerve tracts which connect the two cerebral hemispheres. Below this, at right of cerebellum, are regions of the brainstem which connect to the spinal cord. Blood vessels supplying the cerebrum are seen. An adult human brain weighs about 1400 grams.