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Related Concept Videos

Action Potential01:14

Action Potential

12.2K
Neurons communicate by firing action potentials—the electrochemical signal that is propagated along the axon. The signal results in the release of neurotransmitters at axon terminals, thereby transmitting information to the nervous system. An action potential is a specific "all-or-none" change in membrane potential that results in a rapid spike in voltage.
Membrane potential in neurons
Neurons typically have a resting membrane potential of about -70 millivolts (mV). When they receive...
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Action Potential01:31

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Neurons communicate by firing action potentials—the electrochemical signal that is propagated along the axon. The signal results in the release of neurotransmitters at axon terminals, thereby transmitting information to the nervous system. An action potential is a specific "all-or-none" change in membrane potential that results in a rapid spike in voltage.
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Action Potential: Phases of Stimulation01:28

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The action potential is a complex electrical event that occurs in excitable cells, such as neurons and muscle cells. It consists of several distinct phases, each with specific characteristics.
Resting Phase:
In this phase, the cell's membrane is at its resting potential, typically around -70 millivolts (mV) for neurons. Inside the cell, there is a higher concentration of potassium ions (K+) and a lower concentration of sodium ions (Na+). Voltage-gated sodium channels are closed, and...
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Action Potentials01:41

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Overview
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Propagation of Action Potentials01:23

Propagation of Action Potentials

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The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron.
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...
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Related Experiment Video

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Acute Dissociation of Lamprey Reticulospinal Axons to Enable Recording from the Release Face Membrane of Individual Functional Presynaptic Terminals
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A phantom axon setup for validating models of action potential recordings.

Olivier Rossel1, Fabien Soulier2, Serge Bernard3

  • 1DEMAR Team, INRIA, Montpellier, France. rossel@lirmm.fr.

Medical & Biological Engineering & Computing
|March 27, 2016
PubMed
Summary

This study introduces a novel method to measure nerve action potentials, confirming that signals are stronger at the nodes of Ranvier. This finding validates computer simulations for electroneurogram recording development.

Keywords:
Axon emulationENGExtracellular action potentialModel of myelinated axonPhantom axonRecording electrodeSingle fiber action potential

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Electrophysiology

Background:

  • Electroneurogram recordings are crucial for understanding neural activity.
  • Current methods rely heavily on simulations and animal models, with limited long-term human implantation.
  • Previous models suggested amplitude differences at axonal nodes of Ranvier, but in vivo validation was lacking.

Purpose of the Study:

  • To investigate the amplitude differences of action potentials along an axon's longitudinal axis.
  • To introduce and validate an experimental method for recording single-fiber action potentials.
  • To compare experimental findings with existing computer simulation models.

Main Methods:

  • Development of an experimental setup to emulate a single fiber action potential in a conductive volume.
  • Recording of potentials at nodes of Ranvier and internodes using a phantom axon model.
  • Systematic variation of electrode-to-fiber radial distances.

Main Results:

  • Action potential amplitude at short radial distances was approximately twice as large at nodes of Ranvier compared to internodes.
  • Measured action potential amplitude remained relatively constant along the longitudinal axis at greater radial distances.
  • Experimental results showed a high correlation (97.6%) with computer simulation predictions.

Conclusions:

  • The developed experimental method successfully emulates and records nerve action potentials.
  • Findings confirm theoretical predictions of higher signal amplitude at nodes of Ranvier.
  • The study validates computer simulations, paving the way for improved electrode design for human applications.