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Related Concept Videos

The Role of Ion Channels in Neuronal Computation01:19

The 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.
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Action Potentials

Overview
Action Potential01:14

Action Potential

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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Neurons typically have a resting membrane potential of about -70 millivolts (mV). When they receive...
Action Potential01:14

Action Potential

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...
Action Potential: Phases of Stimulation01:28

Action Potential: Phases of Stimulation

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...
Propagation of Action Potentials01:23

Propagation of Action Potentials

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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Contribution of the Na+/K+ Pump to Rhythmic Bursting, Explored with Modeling and Dynamic Clamp Analyses
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First node of Ranvier facilitates high-frequency burst encoding.

Maarten H P Kole1

  • 1Neuroscience Department, The John Curtin School of Medical Research, The Australian National University, Canberra, ACT 0200, Australia. m.kole@nin.knaw.nl

Neuron
|August 27, 2011
PubMed
Summary
This summary is machine-generated.

The first node of Ranvier is crucial for generating high-frequency action potential (AP) bursts in neurons. Its persistent sodium current influences AP initiation at the axon initial segment, impacting neuronal computation.

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Area of Science:

  • Neuroscience
  • Cellular Biology
  • Computational Neuroscience

Background:

  • The first node of Ranvier is situated at the initial axonal branchpoint, approximately 100 μm from the axon initial segment.
  • The precise role of the first node in signal transformation, particularly in action potential (AP) generation, remains incompletely understood.

Purpose of the Study:

  • To investigate the functional significance of the first node of Ranvier in neocortical layer 5 axons.
  • To determine if the first node contributes to intrinsic high-frequency AP bursting and signal processing.

Main Methods:

  • Studied neocortical layer 5 axons, focusing on the first axonal branchpoint.
  • Utilized pharmacological block of nodal sodium (Na+) channels and axotomy of the first node.
  • Recorded somatic AP voltage thresholds and AP firing patterns in response to controlled currents and simulated synaptic inputs.

Main Results:

  • The first branchpoint was found to be essential for intrinsic high-frequency (≥ 100 Hz) AP bursts.
  • Blocking nodal Na+ channels or severing the first node depolarized the somatic AP threshold by ~5 mV.
  • These interventions selectively abolished APs within high-frequency clusters, affecting responses to steady and simulated synaptic inputs.

Conclusions:

  • The persistent Na+ current at the first node of Ranvier exerts an anterograde influence on AP initiation at the axon initial segment.
  • The first node of Ranvier plays a computational role beyond merely conducting propagating action potentials.
  • This finding highlights a novel mechanism for neuronal signal processing at the initial segment and axonal branching.