Editing Grey matter (section)

== Function ==
Grey matter contains most of the brain's neuronal cell bodies.<ref>{{cite journal | vauthors = Miller AK, Alston RL, Corsellis JA | title = Variation with age in the volumes of grey and white matter in the cerebral hemispheres of man: measurements with an image analyser | journal = Neuropathology and Applied Neurobiology | volume = 6 | issue = 2 | pages = 119–32 | year = 1980 | pmid = 7374914 | doi = 10.1111/j.1365-2990.1980.tb00283.x | s2cid = 23201991 }}</ref> The grey matter includes regions of the brain involved in muscle control, and sensory perception such as seeing and hearing, memory, emotions, speech, decision-making, and self-control.

The grey matter in the [[spinal cord]] is split into three grey columns:
* The [[anterior grey column]] contains [[motor neuron]]s. These [[synapse]] with interneurons and the [[axon]]s of cells that have travelled down the [[pyramidal tract]]. These cells are responsible for the movement of muscles.
* The [[posterior grey column]] contains the points where [[sensory neuron]]s synapse. These receive sensory information from the body, including [[fine touch]], [[proprioception]], and [[vibration]]. This information is sent from receptors of the skin, bones, and joints through sensory neurons whose cell bodies lie in the dorsal root ganglion. This information is then transmitted in axons up the spinal cord in spinal tracts, including the [[dorsal column-medial lemniscus tract]] and the [[spinothalamic tract]].
* The [[lateral grey column]] is the third column of the spinal cord.

The grey matter of the spinal cord can be divided into different layers, called [[Rexed laminae]]. These describe, in general, the purpose of the cells within the grey matter of the spinal cord at a particular location.

<gallery>
File:Anatomy and physiology of animals A reflex arc.jpg|[[Interneuron]]s present in the grey matter of the spinal cord
File:Medulla spinalis - Substantia grisea - English.svg|[[Rexed laminae]] groups the grey matter in the spinal cord according to its function.
</gallery>