Grey matter


Grey matter

Infobox Anatomy
Name = PAGENAME
Latin = substantia grisea
GraySubject =
GrayPage =


Caption = The formation of the spinal nerve from the dorsal and ventral roots. (Grey matter labeled at center right.)


Caption2 =
System =
MeshName =
MeshNumber =
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 (astroglia and oligodendrocytes), capillaries, and short nerve cell extensions/processes (axons and dendrites).

Composition

It is composed of cell bodies as opposed to white matter (cell axons). It has a gray brown color which comes from the capillary blood vessels and the neuronal cell bodies.

Distribution

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).

Function

The function of gray matter is to route sensory or motor stimulus to interneurons of the CNS in order to create a response to the stimulus through chemical synapse activity. Gray matter structures (cortex, deep nuclei) process information originating in the sensory organs or 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.

References

ee also

*Gray matter heterotopia
*Neuropil
*Rexed laminae
*substantia nigra
*White matter

External links

*


Wikimedia Foundation. 2010.

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


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.