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Neuromuscular Junction And Blockade

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The site of chemical communication between a motor neuron and a muscle fiber is called the neuromuscular junction (NMJ). The end of the motor neuron at the NMJ divides into a cluster of synaptic end bulbs. The cytoplasm of these bulbs consists of synaptic vesicles enclosing acetylcholine molecules, the principal neurotransmitter released at the NMJ. The region opposite the synaptic bulb that ends in the muscle fiber is called the motor end plate, which has acetylcholine receptors. Within the...

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Related Experiment Video

Updated: Dec 4, 2025

Assessing Microglial Phagocytosis of Myelin Debris in vitro Under Repeated Magnetic Stimulation

Assessing Microglial Phagocytosis of Myelin Debris in vitro Under Repeated Magnetic Stimulation

Published on: June 17, 2025

Axonal blockage with microscopic magnetic stimulation.

Jordan Skach¹, Catherine Conway¹, Lauryn Barrett¹

¹Department of Biology, Loyola University Chicago, Chicago, IL, USA.

Scientific Reports

|October 23, 2020

Summary

This summary is machine-generated.

Miniature magnetic coils can reversibly block nerve signals in axons. This novel approach offers a promising, biocompatible alternative for treating neurological disorders by preventing action potential propagation.

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Area of Science:

Neuroscience
Biomedical Engineering
Biophysics

Background:

Neurological dysfunctions often involve aberrant nerve activity.
Electrical stimulation via implanted electrodes shows therapeutic potential but faces challenges like poor biocompatibility and reduced chronic efficacy.
Miniature magnetic coils offer a potential solution to overcome these limitations.

Purpose of the Study:

To investigate the efficacy of submillimeter magnetic coils in reversibly blocking action potentials in unmyelinated axons.
To elucidate the underlying biophysical mechanisms responsible for magnetic coil-induced axonal blockage.

Main Methods:

Utilized a submillimeter magnetic coil to stimulate unmyelinated axons from Aplysia californica.
Employed a multi-compartment computational model to simulate axonal response to magnetic stimulation.
Analyzed changes in axonal membrane potential and sodium channel dynamics.

Main Results:

Demonstrated reversible blockage of action potentials in Aplysia axons using miniature magnetic coils.
The magnetic coil induced significant local depolarization, altering sodium channel activation dynamics.
The coil effectively prevented the propagation of action potentials along the axon.

Conclusions:

Submillimeter magnetic coils can effectively and reversibly block axonal conduction.
The mechanism involves local depolarization and modulation of sodium channel kinetics.
Micro coils represent a promising, biocompatible alternative to electrical stimulation for clinical applications in neurological disorders.