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The cerebral cortex is the layer of the neuronal tissue referred to as gray matter, positioned along the outer surface of the cerebral hemispheres. The cerebral cortex consists of folded bulges called gyri that create deep furrows called sulci. It encompasses about 2/3 of the brain mass and lies over and around most of the structures of the brain. It is the most highly developed part of the human brain and is responsible for thinking, perceiving, generating and understanding language.