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| a blood vessel that conveys blood from the heart to any part of the body |
| situated under the tongue, or on the underside of the tongue |
| white matter | |
| —n | |
| 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.
| white matter
The whitish tissue of the vertebrate brain and spinal cord, made up chiefly of nerve fibers (axons) covered in myelin sheaths. Compare gray matter. |