Analyse der Nerveneigenschaften durch Wechselstrommessungen mit Hilfe der Membrankernleitertheorie

Labes, Richard; Lullies, E.

doi:10.1007/bf01752030

Cited by 23 publications

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“…The impedance of several nerves has been measured in this manner (Kriiger, 1928;Lullies, 1930Lullies, , 1934Cole and Curtis, 1936). Labes and Lullies (1932) have interpreted the data of the latter on the basis of a coreconductor model with a double layer and a diffusion capacity at the axon membrane.A more satisfactory analysis of this "lon~tudinal" impedance would involve not only the flow of current into and along a single axon, but also the electrical properties of the other axons in the nerve trunk and the current flow through and around them. Such an analysis would be difficult and probably too cumbersome to be useful, so it is expedient to look for an experimental technique where the results can be analyzed more easily.A length of nerve may also be laid between two long parallel electrodes so that the direction of the current flow will be primarily perpendicular to the axon axes.…”

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Transverse Electric Impedance of the Squid Giant Axon

Curtis

Cole

1938

Journal of General Physiology

102

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The impedance of the excised giant axon from hindmost stellar nerve of Loligo pealii has been measured over the frequency range from 1 to 2500 kilocycles per second. The measurements have been made with the current flow perpendicular to the axis of the axon to permit a relatively simple analysis of the data. It has been found that the axon membrane has a polarization impedance with an average phase angle of 76° and an average capacity of 1.1µf./cm2 at 1 kilocycle. The direct current resistance of the membrane could not be measured, but was greater than 3 ohm cm.2 and the average internal specific resistance was four times that of sea water. There was no detectable change in the membrane impedance when the axon lost excitability, but some time later it decreased to zero.

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