|Compare grey matter Technical name: substantia alba the whitish tissue of the brain and spinal cord, consisting mainly of myelinated nerve fibres|
white matter n.
Whitish nerve tissue, especially of the brain and spinal cord, chiefly composed of myelinated nerve fibers and containing few or no neuronal cell bodies or dendrites. Also called alba, substantia alba, white substance.
The whitish tissue of the vertebrate brain and spinal cord, made up chiefly of nerve fibers (axons) covered in myelin sheaths. Compare gray matter.