We have discussed the generation of local circuit currents as a consequence of membrane activation and the role these currents play in impulse propagation. Because such currents flow into the extracellular medium, they may be detected with extracellular electrodes and even body surface electrodes. The electrocardiogram is a familiar such example: the sources of these body surface potentials are the combined action currents of many cardiac cells.
KeywordsVolume Conductor Dipole Source Field Point Source Density Dipole Strength
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