A manual of practical medical electricity - the Röntgen rays and Finsen light (1902) (14803540983)

Identifier: manualofpractica00turn (find matches)
Title: A manual of practical medical electricity : the Röntgen rays and Finsen light
Year: 1902 (1900s)
Authors: Turner, Dawson
Subjects: X-Rays Electrophysiology Electrosurgery Electric Stimulation Therapy Electrotherapeutics X-rays Electrophysiology Electrosurgery
Publisher: New York : William Wood & Company
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School



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which electrode we maybe using, because we virtually have both electrodes appliedin close proximity to each other to the one nerve. Supposewe close with the anode in position, then the side of thenerve nearest to us becomes anelectrotonic, which does notstimulate ; but the other side becomes katelectrotonic,which does stimulate ; hence we obtain a contraction,which we term A.C.C. If we open, then the area of the nerve farthest from theelectrode returns to normal excitability (disappearance ofkatelectrotonus), which does not stimulate ; but the areanearest to the electrode, which was anelectrotonic (in acondition of lessened excitability), now returns to normal.That is to say, we have a disappearance of anelectrotonus,which does stimulate. Similarly, with the kathode in II i62 A Manual of Practical Medical Electricity position, katelectrotonus becomes established on closingon the near side, and anelectrotonus on the far side, of thenerve ; hence a contraction occurs from the appearance
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of katelectrotonus. On opening, katelectrotonus disap-pears on one side and anelectrotonus on the other ; andthe disappearance of anelectrotonus is the stimulus. Electro-Physiology 163 Further, as the effect of the current depends largelyupon its concentration or density, and as this must, ccBterisparibus, be greatest on the side nearest the electrode, theestabhshment of katelectrotonus on that side of the nervewill be a stronger stimulus than the establishment of kat-electrotonus on the other side ; i.e., K.C.C. will alwaysappear before iV.C.C, and K.C.C. will also appear beforeA.O.C., because it is physiologically the stronger stimulus. This (electrotonic) explanation of the laws of contrac-tion is the one generally accepted in Germany, GreatBritain, and America, though not in France. Waller andDe Watteville, by a series of elaborate and careful experi-