Encyclopedia of Computational Neuroscience

Living Edition
| Editors: Dieter Jaeger, Ranu Jung

Resistivity, Axial

  • John BekkersEmail author
Living reference work entry
DOI: https://doi.org/10.1007/978-1-4614-7320-6_35-2



The axial resistivity, Ri, is a measure of the Ohmic resistance of the intracellular medium of a neuronal process (e.g., axon or dendrite). Ri is defined as the resistance of the medium contained within a fixed-radius cylinder of unit length and unit cross-sectional area, measured between the flat ends of the cylinder. The most commonly used units are Ω cm, in which case the dimensions of the cylinder are in cm. For neurons, Ri is typically on the order of 100 Ω cm.

Detailed Description

Explanation of the Units

R i is a specific property of the intracellular medium that should not depend on the dimensions of the cylinder across which it is measured. If the length of the unit cylinder is increased to length L cm, then the total resistance, R T, measured from one end of the cylinder to the other increases to R i L, because current needs to flow through...
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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.Australian National UniversityCanberraAustralia