matter

matter

substance See also substance. [L. materies, substance]
gray m. those regions of the brain and spinal cord which are made up primarily of the cell bodies and dendrites of nerve cells rather than myelinated axons.substantia grisea [NA], gray substance, substantia cinerea;
pontine gray m. pontine nuclei, under nucleus
white m. those regions of the brain and spinal cord that are largely or entirely composed of nerve fibers and contain few or no neuronal cell bodies or dendrites.substantia alba [NA], alba, white substance;

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