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Updated: June 4, 2025
Such an arrangement is provided by another group of nerve-cells in the brain, having as their function the transmission of the nervous current from one area to another. They are called association neurones and transmit the nervous current from sensory areas to motor areas or from one sensory area to another. For example, suppose you see a brick falling from above and you dodge quickly back.
If good acts are a diet and not a medicine, are repeated over and over again, as every new beat of the loom pounds in one new thread, and sense of justice and right is wrought into the very nerve-cells and fibers; if this ground texture of the soul, this "memory and habit-plexus," this sphere of thoughts we oftenest think and acts we oftenest do, is early, rightly and indiscerptibly wrought, not only does it become a web of destiny for us, so all-determining is it, but we have something perdurable to fall back on if moral shock or crisis or change or calamity shall have rudely broken up the whole structure of later associations.
Under ether anesthesia the damage to the nerve-cells is at least four times greater than under nitrous oxid. Inhalation anesthesia is, therefore, but a veneer a mask that "covers the deep suffering of the patient."
Each of these nervous masses contains nerve-cells as well as nerve-fibres, and is capable of generating nerve-force. Each, therefore, acts like a minute brain; and, in fact, the entire ganglionic system of nerves is analogous to the nervous system of certain among the lower animals the crustacea and mollusks.
Dean's exquisite microscopic photographs from sections of the medulla oblongata, which appear to me to promise a new development, if not a new epoch, in anatomical art. It having been settled that the nerve-tubes can very commonly be traced directly to the nerve-cells, the object of all the observers in this department of anatomy is to follow these tubes to their origin.
Down among his nerve-cells and fibers the molecules are counting it, registering it, and storing it up to be used against him when the next temptation comes. Nothing we ever do is, in strict scientific literalness, wiped out. Of course this has its good side as well as its bad one.
As this subject of reflex action is of the highest importance, the reader is advised to make himself thoroughly familiar with the principles involved before perusing the future chapters of this work. It also indicates how such nervous relations may be complicated by other connections of the nerve-cells involved in the reflex action.
Primarily all our body-cells had the power of responding to stimuli, of digesting and elaborating food, of moving by contraction, of reproducing their kind. The nerve-cells are simply a group which have specialized exclusively upon the power of receiving and transmitting impulses.
If the evening be spent in conversation, or mere lounging over books, the supper will not be needed, and will prove, if taken, only a burden; but if, as has already been said, it be spent in actual brain-work, the tremendous and unusual strain on the whole nervous system, occasioned by the destruction of nerve-cells, must be made good, or those organs most intimately connected with the nervous system and the sources of life, will be sure to suffer.
The knowledge we possess of any part is made up of the numberless impressions from without which affect its sensitive surfaces, and which are transmitted through its nerves to the spinal nerve-cells, and through them, again, to the brain.
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