The neuron doctrine is the concept that the nervous system is made up of discrete individual cells, a discovery due to decisive neuro-anatomical work of Santiago Ramon y Cajal and later presented, among others, by H. Waldeyer-Hartz. The term neuron (spelled neurone in British English) was itself coined by Waldeyer as a way of identifying the cells in question. The neuron doctrine, as it became known, served to position neurons as special cases under the broader cell theory evolved some decades earlier. He appropriated the concept not from his own research but from the disparate observation of the histological work of Albert von Kölliker, Camillo Golgi, Franz Nissl, Santiago Ramón y Cajal, Auguste Forel and others.
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“You ask if there is no doctrine of sorrow in my philosophy. Of acute sorrow I suppose that I know comparatively little. My saddest and most genuine sorrows are apt to be but transient regrets. The place of sorrow is supplied, perchance, by a certain hard and proportionately barren indifference. I am of kin to the sod, and partake of its dull patience,—in winter expecting the sun of spring.”
—Henry David Thoreau (1817–1862)