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Related Concept Videos

Generation of Action Potential in Skeletal Muscles01:24

Generation of Action Potential in Skeletal Muscles

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 cell's...
Neuromuscular Junction And Blockade01:29

Neuromuscular Junction And Blockade

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...
Motor Unit Stimulation01:20

Motor Unit Stimulation

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...
Muscle Contraction01:10

Muscle Contraction

In skeletal muscles, acetylcholine is released by nerve terminals at the motor endplate—the point of synaptic communication between motor neurons and muscle fibers. The binding of acetylcholine to its receptors on the sarcolemma allows entry of sodium ions into the cell and triggers an action potential in the muscle cell. Thus, electrical signals from the brain are transmitted to the muscle. Subsequently, the enzyme acetylcholinesterase breaks down acetylcholine to prevent excessive muscle...
Muscle Contraction01:15

Muscle Contraction

Muscle Stimulation Frequency01:22

Muscle Stimulation Frequency

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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Related Experiment Video

Updated: Jul 8, 2026

Simultaneous Intracellular Recording of a Lumbar Motoneuron and the Force Produced by its Motor Unit in the Adult Mouse In vivo
13:07

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Acute nerve compression and the compound muscle action potential.

Mark M Stecker1, Kelly Baylor, Yiumo Michael Chan

  • 1Department of Neurology, Geisinger Medical Center, Danville, PA 17822 USA. mark_stecker@yahoo.com

Journal of Brachial Plexus and Peripheral Nerve Injury
|January 24, 2008
PubMed
Summary

Acute nerve compression significantly reduces compound muscle action potential (CMAP) amplitude before affecting nerve conduction velocity. This finding aids in detecting surgical nerve injuries using intra-operative neurophysiology.

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Simultaneous Intracellular Recording of a Lumbar Motoneuron and the Force Produced by its Motor Unit in the Adult Mouse In vivo
13:07

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The Muscle Cuff Regenerative Peripheral Nerve Interface for the Amplification of Intact Peripheral Nerve Signals
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Published on: January 13, 2022

Area of Science:

  • Neuroscience
  • Surgical Monitoring
  • Biomedical Engineering

Background:

  • Intra-operative neurophysiology relies on detecting acute nerve compression.
  • Understanding compound muscle action potential (CMAP) changes during compression is crucial for surgical monitoring and prevention.

Purpose of the Study:

  • To investigate CMAP alterations during acute mechanical nerve compression.
  • To assess the utility of CMAP parameters for detecting nerve injury during surgery.

Main Methods:

  • A hamster sciatic nerve compression model was used.
  • Pressures up to 2000 mmHg were applied for approximately 3 minutes.
  • Changes in CMAP amplitude and nerve conduction velocity were measured.

Main Results:

  • CMAP amplitude decreased by 50% at ~1000 mmHg, while conduction velocity declined by only 5%.
  • Significant CMAP amplitude changes preceded significant conduction velocity changes.
  • Other CMAP descriptors (duration, latency variation) did not offer earlier detection.

Conclusions:

  • Pure mechanical compression primarily impacts CMAP amplitude.
  • CMAP amplitude is a sensitive indicator for detecting acute nerve compression during surgery.
  • This contrasts with ischemic or stretch injuries where conduction velocity changes are more pronounced relative to amplitude reduction.