[On decrease in spike height of nerve action potential. A comparison between sciatic nerve and ENM (author's transl)].
Employing ENM and a sciatic nerve removed from bullfrog, configuration of decrease of spike under various experimental conditions was studied. The amplitude of the membrane potential change in excitation was also recorded simultaneously with the decrease of spike in ENM (electric nerve model). Both on the nerve and ENM, with decrease of the resting potential, the amplitude of the spike and the amplitude of the change of the membrane potential were decreased. On the nerve and ENM, the decrease in spike amplitudes was induced by an elevation of the niveau and by a lowering of the top. However, the amplitude of the change of membrane potential of ENM was reduced only from the base of the spike due to an elevation of the niveau, with the top remained at a constant level. These decreases of the spike amplitude and the change of the membrane potential in nerve were consistent with that the electric constitution was the same for nerve and ENM, which is the experimental equivalent circut of the nerve fiber devised by the authors.
D000200:Action Potentials; D000818:Animals; D001001:Anura; D004558:Electric Stimulation; D066298:In Vitro Techniques; D008564:Membrane Potentials; D008959:Models, Neurological; D011892:Rana catesbeiana / Q000502:physiology; D012584:Sciatic Nerve / Q000502:physiology*