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Related Concept Videos

Electrical Synapses01:28

Electrical Synapses

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Electrical synapses found in all nervous systems play important and unique roles. In these synapses, the presynaptic and postsynaptic membranes are very close together (3.5 nm) and are actually physically connected by channel proteins forming gap junctions.
Gap junctions allow the current to pass directly from one cell to the next. In contrast, in the chemical synapse, the neurotransmitters carry the information through the synaptic cleft from one neuron to the next. They consist of two...
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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.
Membrane potential in neurons
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Action Potentials01:41

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The Synapse02:47

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Neurons communicate with one another by passing on their electrical signals to other neurons. A synapse is the location where two neurons meet to exchange signals. At the synapse, the neuron that sends the signal is called the presynaptic cell, while the neuron that receives the message is called the postsynaptic cell. Note that most neurons can be both presynaptic and postsynaptic, as they both transmit and receive information.
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Electrochemical Gradient and Channel Proteins: An Overview01:21

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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:
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Neuronal Communication01:28

Neuronal Communication

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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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Contribution of individual excitatory synapses on dendritic spines to electrical signaling.

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Related Experiment Video

Updated: Jul 13, 2025

Voltage-sensitive Dye Recording from Axons, Dendrites and Dendritic Spines of Individual Neurons in Brain Slices
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Electrical properties of dendritic spines.

Dejan Zecevic1

  • 1Department of Cellular and Molecular Physiology, Yale University School of Medicine, New Haven, Connecticut.

Biophysical Journal
|October 14, 2023
PubMed
Summary

Dendritic spines compartmentalize brain signals biochemically, but their electrical role remains debated. Recent optical voltage imaging suggests mushroom spines lack an electrical function in neurons.

Area of Science:

  • Neuroscience
  • Cell Biology

Background:

  • Dendritic spines are crucial for excitatory synaptic transmission.
  • Spines are accepted as biochemical compartments for neural signal integration and plasticity.
  • The electrical role of dendritic spines is debated due to experimental challenges.

Purpose of the Study:

  • To review and critically compare methods for studying spine electrophysiology.
  • To evaluate the evidence for and against an electrical role of dendritic spines.
  • To discuss the limitations and advantages of various experimental approaches.

Main Methods:

  • Literature review of morphological, theoretical, and experimental studies.
  • Analysis of indirect methods: diffusional resistance, glutamate uncaging, calcium imaging.

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  • Examination of direct optical voltage imaging using voltage-sensitive probes.

    • Main Results:

    • Conflicting interpretations exist regarding the electrical role of spines.
    • Different methods yield contradictory conclusions.
    • Optical voltage imaging in cortical pyramidal neurons indicated no electrical role for mushroom spines.

    Conclusions:

    • A consensus on the electrical function of dendritic spines is lacking.
    • Methodological limitations hinder definitive conclusions.
    • Further research with advanced techniques is needed to resolve the debate.