Electro-physiology electrophysiolog00brub Year: 1894 B-42 BRUBAKER. of llelmlioltz, ihut the current (U'lisity quickly dccronsi's with the dis. tance from the electrodes, they recognize, at tlie point of entrance and exit of tiie current from the nerve, two regions,—a pohir, having the same sign as the electrode, and a peripolar, having the opposite sign. (See Figs. 10 and 11.) The peripolar regions also experience similar altera- tions of excitability, though less in degree, according ast hey are cathodic or anodic. As it is impossible to confine the current to the trunk of the nerve when s
Electro-physiology electrophysiolog00brub Year: 1894 B-42 BRUBAKER. of llelmlioltz, ihut the current (U'lisity quickly dccronsi's with the dis. tance from the electrodes, they recognize, at tlie point of entrance and exit of tiie current from the nerve, two regions,—a pohir, having the same sign as the electrode, and a peripolar, having the opposite sign. (See Figs. 10 and 11.) The peripolar regions also experience similar altera- tions of excitability, though less in degree, according ast hey are cathodic or anodic. As it is impossible to confine the current to the trunk of the nerve when surrounded by living tissues, as is easil}' the case when experi- menting with the frog's nerves, it is incorrect to speak of either ascending or descending currents. Waller (' Human Physiology,' p. 363, 1891), who has thoroughly studied the electrotonic effects of the galvanic current from this point of view, sums up his conclusions in the follow- ing words : ' We must apph' one electrode only to the nerve and attend to its effects alone, completing the circuit through a second electrode, which is applied according to convenience to some other part of the body.
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