- Grey matter
Name = PAGENAME
Latin = substantia grisea
Caption = The formation of the spinal nerve from the dorsal and ventral roots. (Grey matter labeled at center right.)
DorlandsPre = s_27
DorlandsSuf = 12766773
Grey matter (or gray matter) is a major component of the
central nervous system, consisting of nerve cell bodies ( neurons), glial cells ( astrogliaand oligodendrocytes), capillaries, and short nerve cell extensions/processes ( axons and dendrites).
It is composed of cell bodies as opposed to
white matter(cell axons). It has a gray brown color which comes from the capillaryblood vessels and the neuronal cell bodies.
Grey matter is distributed at the surface of the
cerebral hemispheres ( cerebral cortex) and of the cerebellum( cerebellar cortex), as well as in the depth of the cerebral ( thalamus; hypothalamus; subthalamus, basal ganglia- putamen, globus pallidus, nucleus accumbens; septal nuclei), cerebellar (deep cerebellar nuclei - dentate nucleus, globose nucleus, emboliform nucleus, fastigial nucleus), brainstem( substantia nigra, red nucleus, olivary nuclei, cranial nerve nuclei) and spinal grey matter ( anterior horn, lateral horn, posterior horn).
The function of gray matter is to route sensory or motor stimulus to
interneuronsof the CNS in order to create a response to the stimulus through chemical synapseactivity. Gray matter structures (cortex, deep nuclei) process information originating in the sensory organsor in other gray matter regions. This information is conveyed via specialized nerve cell extensions (long axons), which form the bulk of the cerebral, cerebellar, and spinal white matter.
Gray matter heterotopia
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Look at other dictionaries:
grey matter — Grey/gray matter is the human brain … The small dictionary of idiomes
grey matter — grey .matter BrE gray matter AmE n [U] informal your intelligence, or your brain … Dictionary of contemporary English
grey matter — ► NOUN 1) the darker tissue of the brain and spinal cord. 2) informal intelligence … English terms dictionary
grey matter — noun greyish nervous tissue containing cell bodies as well as fibers; forms the cerebral cortex consisting of unmyelinated neurons • Syn: ↑gray matter, ↑grey substance, ↑gray substance, ↑substantia grisea • Hypernyms: ↑nervous tissue, ↑nerve… … Useful english dictionary
grey matter — See gray matter. * * * the darker coloured tissues of the central nervous system, composed mainly of the cell bodies of neurones, branching dendrites, and glial cells (compare white matter). In the brain grey matter forms the cerebral cortex and… … Medical dictionary
grey matter — the darker coloured tissues of the central nervous system, composed mainly of the cell bodies of neurones, branching dendrites, and glial cells (compare white matter). In the brain grey matter forms the cerebral cortex and the outer layer of the… … The new mediacal dictionary
grey matter — N UNCOUNT You can refer to your intelligence or your brains as grey matter. [INFORMAL] ...an unsolved mathematical equation which has caused his grey matter to work overtime. (in AM, use gray matter) … English dictionary
grey matter — noun a) Brains, i.e., a persons ability to think. We can succeed if we all use our grey matter. b) A collection of cell bodies and (usually) dendritic connections. :: contrast to … Wiktionary
grey matter — brains, brain capacity, intelligence, smarts Sometimes I wonder if he has any grey matter. Oh, he has it, but maybe he doesn t use it … English idioms
grey matter — British & Australian, humorous, American, humorous your intelligence. It s an entertaining film but it doesn t exactly stimulate the old grey matter … New idioms dictionary