Grey matter
Grey matter (or gray matter) is a main component of the central nervous system. It is composed of neurons (that is, the cells usually called 'brain cells') and glial cells. By contrast, the white matter is composed of long-range myelinated axon tracts (nerve fibres) and glial cells.
The colour difference arises mainly from the whiteness of myelin. In living tissue, grey matter actually has a very light grey colour with yellowish or pinkish hues, which come from capillary blood vessels and neuronal cell bodies.[1][2]
Grey Matter Media
Cross-section of a spinal vertebra with the spinal cord in the centre (and grey matter labelled).
Cross-section of spinal cord with the grey matter labelled.
Interneurons present in the grey matter of the spinal cord
Rexed laminae groups the grey matter in the spinal cord according to its function.
References
- ↑ Kolb & Whishaw 2003. Fundamentals of human neuropsychology, p49.
- ↑ Purves, Dale et al 2008. Neuroscience. 4th ed, Sinauer Associates. p15–16. ISBN 978-0-87893-697-7