. A text-book of physiology : for medical students and physicians . Fig. 32. Fig. 33. Figs. 32 and 33.—Schema to show the arrangement of apparatus for an ascending and adescending current: Fig. 32, ascending; Fig. 33, descending. Ascending Current. Descending Breaking. Making. Breaking. Very weak currents . C O C O Moderate ....C C C C Very strong ....O C C O The effects obtained with the strong currents are readily under-stood if we bear in mind the facts stated above regarding electro-tonus. When the current is ascending the stimulus on makingstarts from the cathode, but cann
. A text-book of physiology : for medical students and physicians . Fig. 32. Fig. 33. Figs. 32 and 33.—Schema to show the arrangement of apparatus for an ascending and adescending current: Fig. 32, ascending; Fig. 33, descending. Ascending Current. Descending Breaking. Making. Breaking. Very weak currents . C O C O Moderate ....C C C C Very strong ....O C C O The effects obtained with the strong currents are readily under-stood if we bear in mind the facts stated above regarding electro-tonus. When the current is ascending the stimulus on makingstarts from the cathode, but cannot reach the muscle because itis blocked by a region of anelectrotonus in which the conduc- 90 THE PHYSIOLOGY OF MUSCLE AND NERVE. tivity is depressed. The stimulus on breaking takes place atthe anode and the impulse encounters no resistance in its passageto the muscle. With the descending current the cathode lies nextto the muscle and the making or cathodal stimulus of course causesa contraction. On breaking, however, the impulse that is startedfrom the anod
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