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Related Concept Videos

Cross-bridge Cycle01:26

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As muscle contracts, the overlap between the thin and thick filaments increases, decreasing the length of the sarcomere—the contractile unit of the muscle—using energy in the form of ATP. At the molecular level, this is a cyclic, multistep process that involves binding and hydrolysis of ATP, and movement of actin by myosin.
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Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
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The Neuromuscular Junction01:19

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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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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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The clinical conditions affecting the skeletal muscle tissue are broadly categorized as musculoskeletal and neuromuscular disorders.
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Related Experiment Video

Updated: Oct 7, 2025

Dissection of Single Skeletal Muscle Fibers for Immunofluorescent and Morphometric Analyses of Whole-Mount Neuromuscular Junctions
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Neuromuscular Junction Dysfunction in Amyotrophic Lateral Sclerosis.

Sagar Verma1,2, Shiffali Khurana1,3, Abhishek Vats4

  • 1Department of Research, Sir Ganga Ram Hospital, Delhi, India.

Molecular Neurobiology
|January 8, 2022
PubMed
Summary

Amyotrophic lateral sclerosis (ALS) involves early damage at the neuromuscular junction (NMJ), challenging the "dying forward" theory. This review explores NMJ changes in ALS and its potential as a therapeutic target.

Keywords:
Amyotrophic lateral sclerosisDying backMotor neuronNeuromuscular junctionSkeletal muscleTerminal Schwann cells

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Area of Science:

  • Neuroscience
  • Neuropathology
  • Molecular Biology

Background:

  • Amyotrophic lateral sclerosis (ALS) is a progressive neurodegenerative disease causing motor neuron loss and muscle denervation.
  • Historically, ALS degeneration was thought to progress from the motor cortex down to the neuromuscular junction (NMJ).
  • Emerging evidence suggests ALS may be a distal axonopathy, with early pathology at the NMJ, supporting a "dying-back" model.

Purpose of the Study:

  • To review the critical role of the neuromuscular junction (NMJ) in the pathogenesis of ALS.
  • To elucidate the molecular alterations within the NMJ's cellular components during ALS.
  • To highlight the NMJ as a potential therapeutic target for ALS treatment.

Main Methods:

  • Comprehensive literature review of studies on ALS and NMJ.
  • Analysis of molecular mechanisms underlying NMJ disassembly in ALS.
  • Synthesis of current research on NMJ-targeted therapies for ALS.

Main Results:

  • The NMJ, a tripartite synapse, undergoes significant molecular changes in ALS.
  • These alterations disrupt effective neuromuscular transmission, contributing to disease progression.
  • The precise triggers for NMJ disassembly in ALS remain incompletely understood.

Conclusions:

  • The NMJ plays a pivotal role in ALS pathogenesis, with early pathological events occurring at this site.
  • Understanding NMJ molecular alterations is crucial for deciphering ALS progression.
  • Targeting the NMJ offers a promising avenue for developing novel ALS therapies.