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Synaptic Signaling

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Neurons communicate at synapses, or junctions, to excite or inhibit the activity of other neurons or target cells, such as muscles. Synapses may be chemical or electrical.
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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: Dec 13, 2025

Deciphering Axonal Pathways of Genetically Defined Groups of Neurons in the Chick Neural Tube Utilizing in ovo Electroporation

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Published on: May 2, 2010

Trans-Axonal Signaling in Neural Circuit Wiring.

Olivia Spead¹, Fabienne E Poulain¹

¹Department of Biological Sciences, University of South Carolina, Columbia, SC 29208, USA.

International Journal of Molecular Sciences

|July 26, 2020

Summary

Axon-axon signaling is vital for neural circuit formation, guiding nerve growth and synapse development. This review details molecular mechanisms of this communication in building brain connections.

Keywords:

adhesion axon sorting axon–axon communication fasciculation growth cone guidance repulsion topographic maps

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Published on: May 2, 2010

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Area of Science:

Neuroscience
Developmental Biology
Molecular Biology

Background:

Neural circuit formation requires precise axon navigation to targets.
Axon-environment and axon-target interactions are established mechanisms.
Axon-axon communication is an emerging critical process.

Purpose of the Study:

To review recent advances in understanding trans-axonal signaling.
To discuss the role of axon-axon interactions in neural circuit development.

Main Methods:

Literature review of recent scientific publications.
Synthesis of findings on molecular mechanisms of trans-axonal signaling.

Main Results:

Trans-axonal signaling influences fasciculation, defasciculation, and repulsion.
These interactions are crucial for pathfinding, sorting, and target selection.
Axon-axon signaling also mediates synaptic connectivity and circuit refinement.

Conclusions:

Axon-axon communication is essential throughout neural circuit formation.
Understanding these molecular mechanisms provides insights into neurodevelopment.
Further research into trans-axonal signaling will illuminate circuit assembly.