Electro-diagnosis and electro-therapeutics : a guide for practitioners and students . e of its verystrong negative modification, has become inexcitable; it can notconduct the stimulation, and therefore no contraction can the ascending current the case is reversed, as is easily seenfrom the figure. Hence with it no contraction takes place at theclosing, but a strong one at the opening. Pfliigers law can not be applied to the human bodywithout modification (as was stated above) for severalreasons, one of which may be presented here (after Erb). 38 ELECTBO-DIAGNOSm Since, with the huma
Electro-diagnosis and electro-therapeutics : a guide for practitioners and students . e of its verystrong negative modification, has become inexcitable; it can notconduct the stimulation, and therefore no contraction can the ascending current the case is reversed, as is easily seenfrom the figure. Hence with it no contraction takes place at theclosing, but a strong one at the opening. Pfliigers law can not be applied to the human bodywithout modification (as was stated above) for severalreasons, one of which may be presented here (after Erb). 38 ELECTBO-DIAGNOSm Since, with the human being, the poles can not beplaced on the naked nerve, the nerve itself, the currenttravels from pole to pole, not through the nerve, butfirst through the skin, and the human nerve is reachedCurrent by current streamers only (see Fig. 15), which areformed because the current tries to distribute itself inthe well-conducting tissues of the subcutaneous stratumor in the interposed layer of muscular tissue, etc. Thuscurrents going in different directions strike the nerve at streamers. riG» 15.—Diagram of Section through the Skin. An underlying nerve is met bycurrent streamers, which spread out between the two electrodes placed uponthe skin. different points, so that we no longer have ascendingand descending currents, such as play a part in Pfliigerslaw. Because of these and other reasons, which need notbe mentioned (see Chapter IV. on the Eeaction of De-generation ), a direct application of animal law to thehuman body is not possible. Still a certain conformityto the law is present in the reaction of human nerves andmuscles to the galvanic current, and here again arise thedifferent effects which occur at closing and opening aswell as with different strengths. To these two factors—namely, (1) the kind of manipu-lation (closing or opening), (2) the current strength (thecurrent direction, as was said, is not taken into consid- THE LAWS OF CONTRACTION 39 eration in the human subj
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