Grey matter (or gray matter) is a major component of the central nervous system, consisting of neuronal cell bodies, neuropil (dendrites and unmyelinated axons), glial cells (astroglia and oligodendrocytes) and capillaries. Grey matter contains neural cell bodies, in contrast to white matter, which does not and mostly contains myelinated axon tracts. The color difference arises mainly from the whiteness of myelin. In living tissue, grey matter actually has a grey-brown color, which comes from capillary blood vessels and neuronal cell bodies.
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Famous quotes containing the words gray and/or matter:
“Chrome: her pretty childface smooth as steel, with eyes that would have been at home at the bottom of some deep Atlantic trench, cold gray eyes that lived under terrible pressure. They say she cooked her own cancers for people who crossed her, rococo custom variations that took years to kill you.”
—William Gibson (b. 1948)
“Everything that is necessary is also easy. You just have to accept it. And the most necessary, the most natural matter on this planet is death.”
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