Child training as an exact science : a treatise based upon the principles of modern psychology, normal and abnormal, by George W. Jacoby.

  • Jacoby, George W., 1856-1940.
Date:
[1914], [©1914]
Catalogue details

Licence: Public Domain Mark

Credit: Child training as an exact science : a treatise based upon the principles of modern psychology, normal and abnormal, by George W. Jacoby. Source: Wellcome Collection.

Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.

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    gether with their nerve cells, are called peripheral nerves, irrespective of whether they are sensory or motor—^that is, whether they convey sensory impressions to the brain, or whether, on the contrary, they convey motor impulses from the brain to the muscles and glands. It wiU not be superfluous to mention here that the sensory nerve tracts are far more complicated than the motor ones. The latter have no intermediary stations; on the other hand, various neurons are always interposed between the neurite which originates from a peripheral ganglion cell and the central neuron belonging to it in the brain cortex. Let us recall at this point that the motor nerves can conduct motion alone but no sensations, the sensory nerves only sensation but no motion. Similarly the individual organs of special sense can conduct only their corresponding sensory impressions and nothing else. This specific prop- erty of the peripheral nerves goes so far that motor nerves may be comprest, bruised or burned without producing the slightest sensation of pain, unless by chance some contiguous sensory nerve be injured at the same time. Likewise, for example, the optic nerve may be cut and ehemi-