Distinguishable by their color
Two substances, distinguishable by their color, namely, the white or medullary and the gray or cortical substance, enter into the formation of nervous matter. Both are soft, fragile, and easily injured, in consequence of which the principal nervous centers are well protected by bony coverings. The nervous substances present two distinct forms nerve fibers and nerve cells. An aggregation of nerve cells constitutes a nerve ganglion.
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