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Related Concept Videos

Electrical Synapses01:28

Electrical Synapses

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...
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.
Assembly of Complex Microtubule Structures01:32

Assembly of Complex Microtubule Structures

Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
The Synapse02:47

The Synapse

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.
Action Potentials01:41

Action Potentials

Overview
Neurons: The Cell Body and the Dendrites01:23

Neurons: The Cell Body and the Dendrites

A typical nerve cell comprises three main components: the cell body, dendrites, and the axon. The cell body, also known as the soma or perikaryon, serves as the central biosynthetic hub housing a nucleus surrounded by cytoplasm containing organelles commonly found in most cells. Notably, Nissl bodies, clusters of the rough endoplasmic reticulum and free ribosomes responsible for protein synthesis, are distinctive features of the neuronal cell body. As neurons age, aggregates of a brown pigment...

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Related Experiment Video

Updated: May 10, 2026

Voltage-sensitive Dye Recording from Axons, Dendrites and Dendritic Spines of Individual Neurons in Brain Slices
12:51

Voltage-sensitive Dye Recording from Axons, Dendrites and Dendritic Spines of Individual Neurons in Brain Slices

Published on: November 29, 2012

Electrical compartmentalization in dendritic spines.

Rafael Yuste1

  • 1Departments of Biological Sciences and Neuroscience, Howard Hughes Medical Institute, and Kavli Institute for Brain Science, Columbia University, New York, NY 10027, USA. rafaelyuste@columbia.edu

Annual Review of Neuroscience
|June 4, 2013
PubMed
Summary
This summary is machine-generated.

Dendritic spines, crucial for neural communication, act as independent electrical compartments. Their unique electrical properties amplify synaptic potentials, influencing neuronal integration and synaptic plasticity for complex brain functions.

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Published on: November 29, 2012

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Area of Science:

  • Neuroscience
  • Cellular Neuroscience
  • Computational Neuroscience

Background:

  • Excitatory inputs in the central nervous system (CNS) predominantly target dendritic spines.
  • Dendritic spines are increasingly recognized for their role beyond mere connectivity, potentially acting as independent electrical compartments.

Purpose of the Study:

  • To explore the electrical properties of dendritic spines.
  • To understand how spine electrical behavior influences neuronal integration and synaptic plasticity.

Main Methods:

  • The study likely involved computational modeling and/or electrophysiological recordings to analyze spine electrical behavior.
  • Analysis focused on voltage changes during synaptic potentials and action potentials.

Main Results:

  • Spines sustain higher depolarizations than dendritic shafts during excitatory postsynaptic potentials (EPSPs).
  • Synaptic potentials are amplified at the spine head and attenuated at the spine neck.
  • These electrical properties are attributed to passive and active mechanisms.

Conclusions:

  • Spine electrical properties prevent dendritic saturation during high input activity.
  • Spines influence dendritic integration and contribute to synaptic plasticity.
  • The electrical behavior of spines supports a model of "synaptic democracy" for flexible neural computation.