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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.
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...
Electrochemical Gradient and Channel Proteins: An Overview01:21

Electrochemical 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...
Resting Potential Decay01:15

Resting Potential Decay

The resting membrane potential of a neuron (-70mV) is sustained due to the selective ion permeability of the membrane. At the resting potential, the membrane is slightly permeable to ions like sodium (Na+) and chloride (Cl−) and highly permeable to potassium ions (K+). Differences in the ions' concentration inside the cell compared to the outside are maintained by membrane transport proteins like channels and pumps.
At rest, the K+ is the main ion that moves across the membrane through...
Neural Circuits01:25

Neural 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 Communication01:28

Neuronal 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...

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Real-time Electrophysiology: Using Closed-loop Protocols to Probe Neuronal Dynamics and Beyond
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Potassium diffusive coupling in neural networks.

Dominique M Durand1, Eun-Hyoung Park, Alicia L Jensen

  • 1Department of Biomedical Engineering, Neural Engineering Center, Case Western Reserve University, Cleveland, OH 44106, USA. dxd6@case.edu

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|July 7, 2010
PubMed
Summary
This summary is machine-generated.

Potassium diffusion in neural tissue can synchronize neuronal activity and generate abnormal network activity. Elevated extracellular potassium can also block neural signal propagation, impacting network function.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Biophysics

Background:

  • Neuronal excitability is modulated by extracellular ionic concentrations.
  • Elevated extracellular potassium ([K(+)](o)) is linked to neuronal hyperexcitability and epileptiform activity.
  • The precise role of potassium in the generation and propagation of neural activity remains unclear.

Purpose of the Study:

  • To review the role of potassium diffusion in neural network function.
  • To investigate how potassium mediates synchronization and abnormal activity.
  • To examine the impact of potassium on axonal signal propagation.

Main Methods:

  • Review of experimental and computational studies.
  • Computer modeling of diffusive coupling in neural networks.
  • Analysis of potassium's role in synchronization, activity generation, and signal propagation.

Main Results:

  • Potassium diffusion synchronizes neuronal activity across tissue disruptions.
  • Potassium mediates communication, generating abnormal/periodic activity in small and large networks.
  • Elevated extracellular potassium can impede axonal signal propagation.

Conclusions:

  • Potassium accumulation and diffusion significantly influence neural network dynamics.
  • Potassium plays a critical role in both generating and potentially inhibiting neural activity.
  • Understanding potassium's role is crucial for comprehending neural disorders like epilepsy.