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Mapping electric currents around skeletal muscle with a vibrating probe.

W J Betz, J H Caldwell

The Journal of General Physiology

|February 1, 1984

Summary

A vibrating probe maps electric currents around muscle fibers, revealing a spatial resolution limit of tens of micrometers. This technique accurately models current flow, even along the cable-like properties of muscle fibers.

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Area of Science:

Biophysics
Electrophysiology
Cellular Biology

Background:

Understanding electric current flow in biological tissues is crucial for cellular electrophysiology.
The vibrating probe technique offers a method for mapping extracellular currents with high spatial resolution.

Purpose of the Study:

To map artificially created electric currents around single frog muscle fibers.
To determine the spatial resolving power of the vibrating probe.
To model current flow patterns, both extracellularly and intracellularly.

Main Methods:

Utilized a vibrating microelectrode (vibrating probe) to map electric currents.
Impaled single muscle fibers with a micropipette to create a defined current sink.
Passed current through micropipettes (extracellularly and intracellularly) and mapped its distribution.
Employed computer modeling to fit experimental results.

Main Results:

The vibrating probe demonstrated a spatial resolution limit of a few tens of micrometers under experimental conditions.
Current flow from an extracellular electrode followed an inverse square decay with distance.
Intracellular current injection revealed cable-like current propagation along the muscle fiber axis.
Computer models provided good fits for the observed current patterns.

Conclusions:

The vibrating probe is a valuable tool for mapping electric currents in biological systems with high spatial resolution.
The study successfully modeled extracellular and intracellular current flow, validating the probe's utility.
Muscle fibers exhibit cable-like electrical properties influencing current propagation.

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