File:A manual of practical medical electricity - the Röntgen rays and Finsen light (1902) (14783700525).jpg

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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able paralysis (after Erb). The accompanying charts of Professor Erb will serveto demonstrate the phenomena. Varieties of R.D. A case of complete and typical R.D. has been described,but such a case is not always met with ; there are manydegrees of the condition classed under the general term, Partial R.D., or Atypical R.D. In the most important variety the nerve may be quiteunable to conduct voluntary impulses, though it retainsthe power of conducting, often somewhat less efficiently, Electro-Diagnosis 219 faradic and galvanic stimuli. The muscles respond tofaradism, but in a diminished degree, while the responseto galvanism is characterized by the serial and pathogno-monic modal changes of complete R.D. (Fig. 117). In another variety, occurring sometimes in lead para-lysis, a complete and partial R.D. may be seen in muscleswhich show no signs of paralysis. It ris important to remember that the most essential Motility^ I fGalv. ... 5 V Farad. ^ rCalv. andj; -! farad, es-^ V citability
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Fig. 117.—Scheme of the Partial Form of R.D. The faradic and galvanic excitability of the nerve and the faradicexcitability of the muscle are but (slightly lowered. Voluntarypower soon restored (after Erb). and characteristic features of R.D. are the modal changes ;without them the condition should not be diagnosed. Value of R.D. in Localization and Prognosis. (a) Localization.—The presence of R.D. permits us toform the following conclusions : 1. The neuro-muscular area exhibiting the phenomenaof R.D. is undergoing degenerative changes. 2. If only one muscle be affected, the degenerative pro-cess is confined to it and to its nerve fibril, intramuscularnerve terminations, and motor end plate. 3. If a group of muscles supplied by one nerve-trunk beaffected, then the process is confined to these muscles andto the nerve-trunk supplying them, and the lesion is prob-ably situated in the latter. 220 A Manual of Practical Medical Elfxtricity 4. If groups of muscles having a physiological

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