Elements of human physiology (1907) Elements of human physiology elementsofhumanp05star Year: 1907 NERVE-FIBRES (CONDUCTING TISSUES) 173 Electrical Stimuli as aiyplied to Human Nerves When we attempt to apply the results gained on frog's nerves to man, we are met at once by the difficulty that we cannot dissect out the nerves and apply stimuli to them directly. So usually unipolar excitation is used, one electrode, either anode or kathode, being applied to the nerve to be stimulated, and the other to some indifferent point, such as the back. It is evident under these circumstances that the cu
Elements of human physiology (1907) Elements of human physiology elementsofhumanp05star Year: 1907 NERVE-FIBRES (CONDUCTING TISSUES) 173 Electrical Stimuli as aiyplied to Human Nerves When we attempt to apply the results gained on frog's nerves to man, we are met at once by the difficulty that we cannot dissect out the nerves and apply stimuli to them directly. So usually unipolar excitation is used, one electrode, either anode or kathode, being applied to the nerve to be stimulated, and the other to some indifferent point, such as the back. It is evident under these circumstances that the current is con- centrated as it leaves the anode and reaches the kathode, and Diagram of anangcment of experiment for investigating the influence of the intrapolar length of nerve on the excitatory effect of the current. diffuses widely in the body, seeking the lines of least resistance. Thus it is impossible to get pure anodic or kathodic effects. If the anode be applied over the nerve, the current enters by a series of points (the polar zone), and leaves by a second series (the peripolar zone). The polar zone will thus be in the condition of anelectrotonus, and the peripolar zone in that of katelectrotonus. The current however will be more con- centrated at the polar than at the peripolar zone, and so the former effect will predominate. These restrictions in the
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