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The cerebral cortex is a sheet of neural tissue that is outermost to the cerebrum of the mammalian brain. It plays a key role in memory, attention, perceptual awareness, thought, language, and consciousness. It is constituted of up to six horizontal layers, each of which has a different composition in terms of neurons and connectivity. The human cerebral cortex is 2 4 mm (0.08 0.16 inches) thick. In preserved brains, it has a grey color, hence the name "grey matter". In contrast to grey matter that is formed from neurons and their unmyelinated fibers, the white matter below them is formed predominantly by myelinated axons interconnecting neurons in different regions of the cerebral cortex with each other and neurons in other parts of the central nervous system. The surface of the cerebral cortex is folded in large mammals, such that more than two-thirds of it in the human brains is buried in the grooves, called "sulci." The phylogenetically most recent part of the cerebral cortex, the neocortex, (also called isocortex), is differentiated into six horizontal layers.
0.224 x 0.152 x 0.013 m; 0.272 kg