Calculated potential and electric field distributions around an active nerve fiber

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Abstract
Potential distributions around a model nerve fiber are computed by using analytical methods. The fiber is situated either in a homogeneous isotropic unbounded conductor or in a homogeneous isotropic cylinder. In the latter case the source is placed either centrically or eccentrically. The potential distributions are used to derive the precise electric field distribution. The results are presented in equipotential and field line maps. It is described how the inherent numerical problems in the calculations can be avoided. It is demonstrated that the boundaries of the volume conductor and the nature of the source (potential source, current source) can significantly influence the field, even at large distances from this source.