All living tissues, both vegetable and animal, are sensitive to stimuli whether normal or abnormal. In the animal kingdom, especially in the higher animals, certain cells and tissues are specially adapted to receive and convey impressions or stimuli to other tissues and organs. We call these cells and tissues the nervous system and subdivide for convenience into the cerebrospinal system—the brain and spinal cord—and the sympathetic, or ganglionic system. Both are alike in that they connect every cell of the twenty-six and one-half billion cells, which some one has computed there are in the human body—of which three thousand million are nerve cells—with every other cell, and so every tissue with every other tissue and each organ with every other, and thus all into one harmonious whole, when in health. And in disease or disaster this same wonderful mechanism communicates, like our telegraph and telephone systems, the joys or the
NELSON DT. SHOCK; ITS NATURE, CAUSE AND TREATMENT. JAMA. 1899;XXXIII(17):1015–1018. doi:10.1001/jama.1899.92450690015002e
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