alexa A calculation of the magnetic field of a nerve action potential.
Engineering

Engineering

Journal of Electrical & Electronic Systems

Author(s): Swinney KR, Wikswo JP Jr

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Abstract The magnetic field outside an isolated axon is calculated using transmembrane potential data to specify the boundary conditions to a solution of Laplace's equation. It is shown that the contribution to the magnetic field from the current inside the membrane is two orders of magnitude larger than that from the external current. The contribution from current within the membrane is negligible. Comparisons are made between waveforms calculated for a crayfish lateral axon and those measured for a frog sciatic nerve. This calculation suggests that the magnetic field measured outside nerves can be used to determine their internal current without puncturing the nerve membrane.
This article was published in Biophys J and referenced in Journal of Electrical & Electronic Systems

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