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Related Concept Videos

Gap Junctions01:27

Gap Junctions

10.3K
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

58.0K
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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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...
11.4K
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...
7.0K
Contact-dependent Signaling01:19

Contact-dependent Signaling

48.2K
Contact-dependent signaling, as the name suggests, requires that communicating cells be in direct contact with each other. This is achieved either through receptor-ligand interactions or by specialized cytoplasmic channels that allow the flow of small molecules between cells. In animal cells, channels called gap junctions facilitate contact-dependent signaling in certain tissues, whereas, plasmodesmata perform a similar function in plants.
Gap Junctions
In animal cells, gap junctions are formed...
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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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Related Experiment Video

Updated: Mar 12, 2026

Cut-loading: A Useful Tool for Examining the Extent of Gap Junction Tracer Coupling Between Retinal Neurons
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Bifurcation transitions in gap-junction-coupled neurons.

Annabelle Shaffer1, Allison L Harris1, Rosangela Follmann1,2

  • 1Department of Physics, Illinois State University, Normal, Illinois 61790, USA.

Physical Review. E
|November 15, 2016
PubMed
Summary

This study examines how two distinct neurons with different firing patterns synchronize when electrically coupled. We found that neuron properties influence their synchronized state, leading to tonic, bursting, or transitioning dynamics.

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Last Updated: Mar 12, 2026

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

  • Computational neuroscience
  • Systems neuroscience
  • Neuronal dynamics

Background:

  • Understanding neuronal synchronization is crucial for deciphering brain function.
  • Investigating coupled neuron dynamics reveals emergent network behaviors.

Purpose of the Study:

  • To explore synchronization transitions in electrically coupled distinct neurons.
  • To analyze how individual neuron properties affect coupled dynamics.

Main Methods:

  • Simulating electrically coupled neuron pairs with tonic and bursting dynamics.
  • Analyzing synchronization regimes (tonic, bursting, transitioning).

Main Results:

  • Coupled neurons synchronize into tonic or bursting states based on individual dynamics and coupling strength.
  • A period-doubling cascade facilitates transitions from tonic to bursting synchronization.
  • Intrinsic neuronal properties, like minimum firing rates, influence the final synchronized state.

Conclusions:

  • Electrically coupled neurons exhibit rich synchronization dynamics.
  • Individual neuron characteristics play a significant role in determining network-level behavior.
  • Period-doubling cascades are a mechanism for state transitions in coupled neuronal systems.