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Related Concept Videos

Motor Unit Stimulation01:20

Motor Unit Stimulation

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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.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...
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Generation of Action Potential in Skeletal Muscles01:24

Generation of Action Potential in Skeletal Muscles

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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.
Like neurons, muscle cells are also regarded as excitable due to their capacity to change in response to stimuli, primarily due to voltage-gated ion channels embedded in their plasma membranes, which get activated by alterations in the...
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Local Anesthetics: Differential Sensitivity of Nerve Fibers01:24

Local Anesthetics: Differential Sensitivity of Nerve Fibers

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Local anesthetics (LAs) block the sodium channels of nerve trunks, sensory nerve endings, and neuromuscular junctions. Although LAs can block all kinds of nerves, the sensitivity of nerve fibers differs according to nerve types and structures. LAs are known to block myelinated fibers faster than unmyelinated ones. Also, they block pain or sensory neurons at low concentrations without affecting the motor neurons involved in muscle contractions. This helps relieve labor pain without affecting the...
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Action Potentials01:41

Action Potentials

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Overview
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Muscle Stimulation Frequency01:22

Muscle Stimulation Frequency

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The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
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Neuromuscular Junction And Blockade01:29

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: Sep 26, 2025

The Fibular Nerve Injury Method: A Reliable Assay to Identify and Test Factors That Repair Neuromuscular Junctions
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Compound Motor Action Potentials During a Modest Nerve Crush.

Mohammed Nazmy Hamad1, Nickolas Boroda1, Diego Barragan Echenique1

  • 1Department of Orthopedic Surgery, University of Illinois Chicago, Chicago, IL, United States.

Frontiers in Cellular Neuroscience
|April 18, 2022
PubMed
Summary

This study introduces a standardized nerve crush injury model using micro-forceps and real-time monitoring of compound motor action potential (CMAP) to achieve reproducible lesions for studying nerve regeneration.

Keywords:
axonotmesiscompound motor action potential (CMAP)controlled compression parameterscontrolled crush parametersforce-impulseinstrumented forceps with force transducernerve crush with feedbackrat sciatic tibial nerve crush injury

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Area of Science:

  • Neuroscience
  • Regenerative Medicine
  • Surgical Research

Background:

  • Nerve crush injuries, a model for axonotmesis, lack standardized production methods.
  • Controlled nerve injury models are crucial for studying regeneration and testing therapies.

Purpose of the Study:

  • To characterize a novel, standardized nerve crush injury model in rats.
  • To establish a reproducible method for inducing controlled nerve compression using micro-forceps.
  • To correlate electrophysiological and histological outcomes of the crush injury model.

Main Methods:

  • Tibial nerves of rats were subjected to controlled crush injury using force-calibrated micro-forceps.
  • Compound motor action potentials (CMAPs) were monitored in real-time to guide injury and assess neuromuscular response.
  • Injuries were halted based on a targeted CMAP amplitude reduction (70%-90%).
  • Histological analysis was performed post-injury to evaluate nerve fiber integrity.

Main Results:

  • A standardized crush injury protocol resulted in an average 81.6% decrease in CMAP amplitude.
  • The mean crush duration was 17 seconds with a maximal applied force of 0.5 N.
  • Histology confirmed partial nerve fiber sparing, correlating with CMAP responses.
  • Some trials showed transient CMAP recovery, while others exhibited near-complete amplitude loss.

Conclusions:

  • A standardized nerve crush model using targeted CMAP reduction provides controlled, reproducible nerve lesions.
  • This model facilitates the study of neuromuscular response to injury and the efficacy of interventions.
  • The model's ability to demonstrate partial nerve sparing aids in evaluating regenerative strategies.