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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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Relaxation of Skeletal Muscles01:29

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The period of muscle contraction primarily influences the duration of stimulation at the neuromuscular junction (NMJ), the presence of free calcium ions in the sarcoplasm, and the availability of energy or ATP to support contractions.
When an action potential reaches the axon terminal, it depolarizes the membrane and opens voltage-gated sodium channels. Sodium ions enter the cell, further depolarizing the presynaptic membrane. This depolarization causes voltage-gated calcium channels to open....
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Cholinergic Receptors: Nicotinic01:15

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Nicotinic receptors are ligand-gated ion channels that are activated by acetylcholine and nicotine. Upon activation, they cause a rapid increase in the permeability of cells to K+, Na+, and Ca2+, followed by depolarization and excitation. They are in the autonomic ganglia, skeletal neuromuscular junction, CNS, and adrenal medulla.
There are two types of nicotinic receptors: neuromuscular (NM/NM/N1) and neuronal (NN/NN/N2). The two families differ based on their location and selectivity to...
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Chemical Synapses01:26

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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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Chemical Synapses01:26

Chemical Synapses

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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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Updated: Nov 5, 2025

Dissection of Single Skeletal Muscle Fibers for Immunofluorescent and Morphometric Analyses of Whole-Mount Neuromuscular Junctions
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Dissection of Single Skeletal Muscle Fibers for Immunofluorescent and Morphometric Analyses of Whole-Mount Neuromuscular Junctions

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Autonomic neuromuscular junctions.

Madeleine R Di Natale1, Martin J Stebbing1, John B Furness1

  • 1Department of Anatomy & Physiology, University of Melbourne, Parkville, VIC 3010, Australia; Florey Institute of Neuroscience and Mental Health, Parkville, VIC 3010, Australia.

Autonomic Neuroscience : Basic & Clinical
|May 15, 2021
PubMed
Summary
This summary is machine-generated.

This review details smooth muscle cells and their motor innervation, explaining how numerous axons influence individual muscle cells through extensive branching and electrical coupling. Understanding this complex neural network is key to smooth muscle function.

Keywords:
Autonomic axonsNeuromuscular transmissionSmooth muscle

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Area of Science:

  • Physiology
  • Neuroscience
  • Cell Biology

Background:

  • Smooth muscle tissue comprises numerous small, electrically connected muscle cells.
  • Motor innervation involves extensive axonal branching forming terminal arbors near muscle cells.
  • Varicosities on axons contain transmitter vesicles, but release probability is low.

Purpose of the Study:

  • To review the historical discovery and understanding of smooth muscle cells.
  • To elucidate the intricate motor innervation of smooth muscle tissue.
  • To present a model of neuronal influence on smooth muscle.

Main Methods:

  • Historical review of scientific literature.
  • Analysis of smooth muscle cell structure and innervation patterns.
  • Development of a conceptual model for neuronal-smooth muscle interaction.

Main Results:

  • Each axon extensively branches, forming thousands of varicosities near hundreds of smooth muscle cells.
  • A single smooth muscle cell can be influenced by 20 or more axons.
  • Neuronal influence involves direct transmitter release and electrical coupling between cells.

Conclusions:

  • Smooth muscle innervation is complex, with multiple axons influencing each cell.
  • Electrical coupling plays a significant role in signal propagation within smooth muscle tissue.
  • A comprehensive model is proposed to explain neuronal control over smooth muscle function.