The cortex of the brain which contains nerve cell
bodies. The gray matter is as opposed to the white matter, the part of the brain that
contains myelinated nerve fibers. The gray matter is so named because it in fact appears
gray. In "The Mysterious Affair at Styles" (1920), Agatha Christie first quoted
the fictional Belgian detective Hercule Poirot in regard to his gray matter:
"'This affair must be unravelled from within.' He tapped his forehead.
'These little grey cells. It is "up to them"-as you say over
here.'"
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