Electro-physiology (1896-98) Electro-physiology . electrophysiolog02bied Year: 1896-98 ix ELECTRICAL EXCITATION OF NERVE 155 strength of current, the action of a single isolated pole. It is clear that if one pole be applied as close to the nerve as possible, while the broad surface of the other rests upon any distant (indifferent) part of the body, the density of the current must be unequal at the physiological anode and kathode of the nerve, but by no means to such an extent that the One —Schema of current distribution! in a nerve in Dole lloiie is involved in S!'' * ''^''• v'r';u
Electro-physiology (1896-98) Electro-physiology . electrophysiolog02bied Year: 1896-98 ix ELECTRICAL EXCITATION OF NERVE 155 strength of current, the action of a single isolated pole. It is clear that if one pole be applied as close to the nerve as possible, while the broad surface of the other rests upon any distant (indifferent) part of the body, the density of the current must be unequal at the physiological anode and kathode of the nerve, but by no means to such an extent that the One —Schema of current distribution! in a nerve in Dole lloiie is involved in S!'' * ''^''• v'r';ua' kathodes; ««, virtual anodes. (Bernstein.) respect of physiological action. This might occasionally be the case with minimal currents, but with even a low increase of current intensity the action of the other pole must come into play. Every nerve that has an anode must have a kathode also, even if only one electrode is directly connected with it, and it depends on the ratio of density between the two poles whether one or the other acts alone or preponderatingly. This agrees with the fact that the make twitch (' anodic closure twitch ' of the pathologist) is observed in monopolar excitation of a motor nerve with the anode as well as with the kathode. The widespread opinion among pathologists ( Brenner, 27) that the results of monopolar excitation of nerve may, theoretically, be set side by side with the facts of ordinary bipolar excitation, and the recent acceptance of this view by some physiologists (Jofe, 28), cannot be admitted for the study of electrical excita- tion of nerve, although the monopolar method may legitimately be applied in single cases. The above theory would undoubtedly lead, as in the case of Jofe, to false conclusions,—con- tradicted by the many facts and experiments underlying the established principles of electro-physiology, which must be the substrate of all future discoveries. We must therefore set aside all attempts to demonstrate the law
Size: 2387px × 838px
Photo credit: © Bookend / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
