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Related Concept Videos

Electrical Synapses01:28

Electrical Synapses

11.7K
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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Overview of Synapses01:25

Overview of Synapses

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A synapse is a specialized structure where two neurons connect, allowing them to pass an electrical or chemical signal to another neuron. It is the point of communication between neurons. The term "synapse" is derived from the Greek word "synapsis," which means "conjunction." The entire process of neural communication revolves around the synapse. When activated, a neuron releases chemicals known as neurotransmitters into the synapse. These neurotransmitters cross the synapse and bind to...
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Gap Junctions01:27

Gap Junctions

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The cytoplasm of adjacent animal cells can exchange small molecules, ions, and secondary messengers via the communication channels which form the gap junctions. These junctions comprise a few hundred to thousands of molecular channels, each made of two halves, called the connexon hemichannel. A connexon is a hexamer of six transmembrane connexin proteins, which assemble radially, thus forming a pore or channel in the center. One connexon hemichannel docks with a corresponding connexon on the...
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Gap Junctions01:37

Gap Junctions

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Multicellular organisms employ a variety of ways for cells to communicate with each other. Gap junctions are specialized proteins that form pores between neighboring cells in animals, connecting the cytoplasm between the two, and allowing for the exchange of molecules and ions. They are found in a wide range of invertebrate and vertebrate species, mediate numerous functions including cell differentiation and development, and are associated with numerous human diseases, including cardiac and...
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Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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Overview of Cell-Cell Junctions01:14

Overview of Cell-Cell Junctions

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The complex three-dimensional arrangement of cells in any multicellular organism is defined and maintained by interactions of cells with each other and the extracellular matrix. Cell-cell junctions are specialized structures where the multi-protein complexes on one cell interact with the multi-protein complexes on another  cell. These cell junctions are classified  into three main types based on their function — occluding, anchoring, and gap junctions.
Occluding or Tight...
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Related Experiment Video

Updated: Mar 22, 2026

Cut-loading: A Useful Tool for Examining the Extent of Gap Junction Tracer Coupling Between Retinal Neurons
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Cut-loading: A Useful Tool for Examining the Extent of Gap Junction Tracer Coupling Between Retinal Neurons

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Mind the Gap Junctions: The Importance of Electrical Synapses to Visual Processing.

Jonathan B Demb1, Joshua H Singer2

  • 1Department of Ophthalmology and Visual Science, Yale University, New Haven, CT 06511, USA; Department of Cellular and Molecular Physiology, Yale University, New Haven, CT 06511, USA.

Neuron
|April 22, 2016
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Summary

Coordinated electrical and chemical synapses in the retina improve sensitivity to moving objects. This neural circuit integration enhances information processing in the central nervous system (CNS).

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Area of Science:

  • Neuroscience
  • Retinal circuitry
  • Synaptic transmission

Background:

  • The retina processes visual information through complex neural circuits.
  • Understanding how different synaptic types interact is crucial for visual processing.

Purpose of the Study:

  • To investigate the functional role of coordinated electrical and chemical synapses in a specific retinal circuit.
  • To determine how this interaction impacts the detection of moving stimuli.

Main Methods:

  • Electrophysiological recordings in retinal explants.
  • Genetic manipulation to target specific synaptic populations.
  • Analysis of neural responses to visual stimuli.

Main Results:

  • Demonstrated that the interplay between electrical and chemical synapses significantly enhances neuronal sensitivity.
  • Identified a specific retinal circuit where this coordination is critical for detecting motion.
  • Showcased improved signal-to-noise ratio in neural responses due to synaptic cooperation.

Conclusions:

  • The coordinated function of electrical and chemical synapses is a key mechanism for efficient visual information processing.
  • This study highlights a specific example of synaptic integration improving sensory perception in the central nervous system (CNS).
  • Findings provide insights into neural computation and potential therapeutic targets for visual impairments.