The human brain is the central organ of the human nervous system , and with the spinal cord makes up the central nervous system . The brain consists of the cerebrum , the brainstem and the cerebellum . It controls most of the activities of the body , processing, integrating, and coordinating the information it receives from the sense organs , and making decisions as to the instructions sent to the rest of the body. The brain is contained in, and protected by, the skull bones of the head . The cerebrum is the largest part of the human brain. It is divided into two cerebral hemispheres . The cerebral cortex is an outer layer of grey matter , covering the core of white matter . The cortex is split into the neocortex and the much smaller allocortex . The neocortex is made up of six neuronal layers , while the allocortex has three or f...
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