. Vegetative neurology; the anatomy, physiology, pharmaco-dynamics and pathology of the sympathetic and autonomic nervous systems . otine only destroysthe electrical conductivity of the pupillary fibers when nicotine ispainted upon the superior cervical ganglion. The results of pharma-cological methods are quite in accord with the degeneration anatom-ical method. We are indebted for our knowledge of most of the anatomicalbases of the reflex tracts, which we shall consider, to the animal ex-periments of Langley and his coworkers. They worked out thecentral origin and the peripheral extension of
. Vegetative neurology; the anatomy, physiology, pharmaco-dynamics and pathology of the sympathetic and autonomic nervous systems . otine only destroysthe electrical conductivity of the pupillary fibers when nicotine ispainted upon the superior cervical ganglion. The results of pharma-cological methods are quite in accord with the degeneration anatom-ical method. We are indebted for our knowledge of most of the anatomicalbases of the reflex tracts, which we shall consider, to the animal ex-periments of Langley and his coworkers. They worked out thecentral origin and the peripheral extension of the vertebral sym-pathetic ganglia by means of the nicotine method. 6. The Myoneural Junctional Tissues.—Pharmacological experi-ments with the paralyzing action of nicotine and the stimulatingaction of adrenalin (which stimulates all ends of the sympatheticsystem) have shown a further physiological characteristic (Wesse-ley, Langley, Lewandowsky). Manifestations of the above namedsubstances could be obtained months or even a year after extirpationof the ganglia, or after degeneration following transection of either Plate 4. Course of the Vegetative Nerve Fibers. (Rudzki & Hornowski.) PHYSIOLOGY OF THE VEGETATIVE SYSTEM 2$ pre-cellular or post-cellular fibers. Adrenalin does not act on everynervous part of the doubly innervated end organ; that is, upon thesympathetic and autonomic. It only acts upon the end organs whichare innervated by the sympathetic; consequently, the toxic actiondoes not occur upon the degenerated nerve ending but upon a chem-ically differentiated part of the end organ which is in some waysassociated with the sympathetic nerve endings. This has been calledby Dickinson, Langley and Elliott neuro-miiscular end-plate. This substance which is placed between nerve endings and thesmooth muscle cells, has also been called myo-nenral junction byFroelich. 7. Distinctive Characteristics of Vegetative Reflexes.—Organicmotor reflexes travel via the vegetative nerve
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