Related Experiment Video
Updated: May 7, 2026
13:24
A Multi-compartment CNS Neuron-glia Co-culture Microfluidic Platform
Published on: September 10, 2009
Generalized cable theory for neurons in complex and heterogeneous media
Claude Bédard1, Alain Destexhe
1Unité de Neuroscience, Information et Complexité (UNIC), CNRS, Gif-sur-Yvette, France.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|September 17, 2013
Summary
This study generalizes cable theory to account for complex extracellular environments, revealing significant impacts on neuronal electrical properties like voltage attenuation. Understanding these complex media is crucial for accurate modeling of neuronal integration.
Area of Science:
- Computational Neuroscience
- Biophysics
- Electrophysiology
Background:
- Traditional cable theory assumes a simple resistive extracellular space.
- Complex electrical properties of extracellular media are not fully incorporated into cable theory.
- The impact of phenomena like ionic diffusion on cable properties remains largely unknown.
Purpose of the Study:
- To generalize cable theory for membranes in complex extracellular media.
- To analyze the influence of non-resistive extracellular properties on neuronal electrical signaling.
- To quantify the effects of phenomena like ionic diffusion on cable properties.
Main Methods:
- Development of generalized cable equations for complex media.
- Analysis of specific cases, including resistive and diffusion-dominated media.
- Numerical simulations comparing generalized and traditional cable models.
Main Results:
- Generalized cable equations reduce to traditional ones in simple resistive media.
- Complex extracellular media, particularly with ionic diffusion, significantly alter voltage attenuation.
- Numerical results demonstrate substantial deviations from traditional cable theory predictions.
Conclusions:
- The electrical properties of both intracellular and extracellular media critically influence neuronal cable filtering.
- Passive integrative properties of neurons are strongly affected by the nature of surrounding media.
- Generalized cable theory provides a more accurate framework for understanding neuronal electrodynamics in complex biological environments.
Related Concept Videos
01:25Neural Circuits
Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...
01:28Neuronal Communication
Neurons, the fundamental units of the brain and nervous system, communicate through complex electrochemical signals that underpin all cognitive and bodily functions. This communication is primarily facilitated by a process involving the generation and propagation of an action potential along the axon of the neuron. When the internal electrical charge of a neuron surpasses a certain threshold, an action potential is triggered. This rapid change in voltage travels swiftly along the axon to the...
01:31Neuron Structure
Overview
01:30Neuron Structure
Neurons are the main type of cell in the nervous system that generate and transmit electrochemical signals. They primarily communicate with each other using neurotransmitters at specific junctions called synapses. Neurons come in many shapes that often relate to their function, but most share three main structures: an axon and dendrites that extend out from a cell body.
Structure and Function of Neurons
The neuronal cell body—the soma— houses the nucleus and organelles vital to cellular...
Structure and Function of Neurons
The neuronal cell body—the soma— houses the nucleus and organelles vital to cellular...
01:19The Role of Ion Channels in Neuronal Computation
A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential.
01:21Electrochemical Gradient and Channel Proteins: An Overview
An electrochemical gradient is a fundamental concept in biology and chemistry. It regulates the movement of ions across cell membranes. This movement is influenced by two factors:
The electrical gradient: The electrical gradient across cell membranes refers to the difference in electric charge between the inside and outside of a cell. This difference drives the movement of ions towards or away from the cells. For instance, if the inside of the cell is more negatively charged relative to the...
The electrical gradient: The electrical gradient across cell membranes refers to the difference in electric charge between the inside and outside of a cell. This difference drives the movement of ions towards or away from the cells. For instance, if the inside of the cell is more negatively charged relative to the...