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Related Concept Videos

The Neuromuscular Junction01:19

The Neuromuscular Junction

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The nervous system consists of complex motor neuron circuits, including upper motor neurons originating from the cerebral cortex and lower motor neurons starting in the spinal cord, coordinating both voluntary and involuntary movements. Among these, somatic motor neurons activate skeletal muscles and are classified into alpha, beta, and gamma types. Alpha neurons are vital for voluntary movement coordination, while gamma neurons adjust muscle spindle sensitivity, and the function of beta...
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Neuromuscular Junction And Blockade01:29

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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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Generation of Action Potential in Skeletal Muscles01:24

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Every cell in the body maintains a membrane potential due to an uneven distribution of positive and negative charges across its plasma membrane. The membrane potential is measured in millivolts and quantifies the difference in charge across the membrane.
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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.
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Excitation-Contraction Coupling in Skeletal Muscles01:20

Excitation-Contraction Coupling in Skeletal Muscles

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Excitation-contraction coupling is a series of events that occur between generating an action potential and initiating a muscle contraction. It occurs at the triad, a structure found in skeletal muscle fibers that comprise a T-tubule and terminal cisternae of the sarcoplasmic reticulum on each side. These triads are visible in longitudinally sectioned muscle fibers. They are typically located at the A-I junction — the junction between the A and I bands of the sarcomere.
When an action...
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Motor Unit Stimulation01:20

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When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
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Updated: Nov 17, 2025

Engineering and Characterization of an Optogenetic Model of the Human Neuromuscular Junction
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Engineering and Characterization of an Optogenetic Model of the Human Neuromuscular Junction

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Neuromuscular Junction Model Optimized for Electrical Platforms.

Emilia A Solomon1, Allison M Rooney1, Arasely M Rodriguez1

  • 1Bioscience Division, Los Alamos National Laboratory, Los Alamos, New Mexico, USA.

Tissue Engineering. Part C, Methods
|February 18, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel in vitro neuromuscular junction (NMJ) platform using genetically modified cells. This system enables precise monitoring of neuron-muscle communication and drug screening for NMJ-affecting compounds.

Keywords:
motor neuronsmultielectrode arrayneuromuscular junctionskeletal muscle

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Biotechnology

Background:

  • Neuromuscular junctions (NMJs) are critical for muscle function, but studying them in vitro is challenging.
  • A need exists for a simple, reproducible cell-based platform to assess chemical impacts on neuron-muscle communication.

Purpose of the Study:

  • To develop and validate a novel in vitro platform for studying neuromuscular junctions.
  • To enable precise, real-time recording and analysis of neuron-muscle signaling.

Main Methods:

  • Utilized genetically modified neuronal (NSC34) and muscle (C2C12) cells.
  • Optogenetically modified neurons for light-mediated activation; enhanced muscle cell communication with Connexin-43.
  • Optimized culture conditions and employed a multielectrode array for action potential recording.

Main Results:

  • Demonstrated successful optogenetic activation of neurons and signal propagation to muscle fibers.
  • Showcased enhanced signal propagation and strength in muscle cells due to gap junction incorporation.
  • Validated the platform's efficacy by successfully blocking muscle response with vecuronium.

Conclusions:

  • The developed in vitro NMJ platform offers a robust and reproducible system for studying neuron-muscle communication.
  • This model is suitable for high-throughput, non-destructive screening of drugs and chemicals impacting NMJ function.