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Updated: Jun 19, 2026
13:56
Modeling Biological Membranes with Circuit Boards and Measuring Electrical Signals in Axons: Student Laboratory Exercises
Published on: January 18, 2011
RECTIFICATION AND INDUCTANCE IN THE SQUID GIANT AXON
1Department of Physiology, College of Physicians and Surgeons, Columbia University, New York.
The Journal of General Physiology
|October 30, 2009
Summary
This study models the squid axon membrane
Area of Science:
- Neuroscience
- Biophysics
- Computational Biology
Background:
- The electrical properties of the squid axon membrane have been previously approximated as a series circuit with a rectifier, shunt capacitor, and inductor.
- Selective ion permeability is a likely source of membrane rectification.
- A quasi-crystalline piezoelectric membrane structure may explain the observed inductance.
Purpose of the Study:
- To develop and analyze a circuit model for the squid axon membrane.
- To investigate the relationship between membrane electrical properties and neuronal excitation phenomena.
- To compare model predictions with experimental observations of axon behavior.
Main Methods:
- Approximate calculations of axon behavior using the proposed circuit model.
- Comparison of calculated subthreshold potential and action potential foot impedance with experimental data.
- Formal analogy between calculated membrane potential and established two-factor excitation models.
Main Results:
- The model shows fair agreement with experimental data for subthreshold potential and action potential foot impedance.
- A formal analogy was found between the calculated membrane potential and excitability.
- Several excitation phenomena were semi-quantitatively explained by assuming excitability is proportional to membrane potential.
Conclusions:
- The proposed circuit model, incorporating capacity, inductance, and rectification, offers a reasonable approximation of squid axon membrane electrical properties.
- The model provides a framework for understanding the link between membrane potential and neuronal excitability.
- Discrepancies indicate the circuit is an approximation, suggesting further refinements are needed for complete accuracy.
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