Definition of Gray matter

1. Noun. Greyish nervous tissue containing cell bodies as well as fibers; forms the cerebral cortex consisting of unmyelinated neurons.


Medical Definition of Gray matter

1. The cortex of the brain which contains nerve cell bodies. The gray matter is in contrast to the white matter, the part of the brain that contains myelinated nerve fibres. The gray matter is so named because it in fact appears gray. The white matter is white because that is the colour of myelin, the insulation covering the nerve fibres. 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.' (12 Dec 1998)

Lexicographical Neighbors of Gray Matter

gray fox
Gray Friar
gray goldenrod
gray hen
gray hepatisation
gray induration
gray infiltration
gray jay
gray kingbird
gray layer of superior colliculus
gray lemming
gray level also gray value
gray level histogram
gray market
gray matter (current term)
gray matter (current term)
gray mullet
gray partridge
gray polypody
gray poplar
gray rami communicantes
gray sage
gray scale
gray sea eagle
gray skate
gray snapper
gray sole
gray substance
gray substance
gray syndrome

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