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Related Concept Videos

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...
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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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

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Related Experiment Video

Updated: Jul 8, 2026

Combining Multiple Data Acquisition Systems to Study Corticospinal Output and Multi-segment Biomechanics
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Published on: January 9, 2016

Do corticomotoneuronal cells predict target muscle EMG activity?

D M Griffin1, H M Hudson, A Belhaj-Saïf

  • 1Department of Molecular and Integrative Physiology, University of Kansas Medical Center, Kansas City, KS 66160-7336, USA.

Journal of Neurophysiology
|December 28, 2007
PubMed
Summary

Cortical neurons activate in sync with target muscle activity during reach-to-grasp movements. Ensemble activity of these neurons effectively predicts muscle activation patterns, supporting a muscle-based motor control framework.

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Published on: May 24, 2017

Area of Science:

  • Neuroscience
  • Motor Control
  • Computational Neuroscience

Background:

  • Understanding how the primary motor cortex (M1) controls voluntary movements is crucial.
  • Corticospinal pathways, particularly corticomotoneuronal (CM) cells, are key mediators of motor output.
  • The precise relationship between individual CM cell activity and specific muscle activation patterns remains an active area of research.

Purpose of the Study:

  • To investigate the relationship between cortical cell activation patterns and the electromyographic (EMG) activity of facilitated target muscles during reach-to-grasp movements.
  • To determine if CM cells encode movement via muscle-based parameters.
  • To examine the contribution of CM cell ensembles to motor control.

Main Methods:

  • Recorded activity of M1 cortical neurons and EMG from 22-24 forelimb muscles in two rhesus macaques during reach-to-grasp tasks.
  • Identified CM cells using postspike facilitation (PSpF) in spike-triggered averages (SpTAs) of EMG.
  • Quantified covariation using peak analysis, timing/overlap assessment, and Pearson correlation between CM cell firing rate and EMG activity.

Main Results:

  • Nearly all (95%) tested CM cells showed a firing rate peak coinciding with a target muscle EMG activity peak.
  • While some individual CM cells exhibited strong correlations with target muscles, substantial disparities were common.
  • Ensemble activity of a small group of CM cells targeting the same muscle yielded a strong match (r ≥ 0.8) to the muscle's EMG pattern.

Conclusions:

  • Corticospinal output from M1 appears to encode movement using muscle-based parameters, specifically muscle activation patterns.
  • Ensemble coding by CM cells provides a robust representation of muscle activity.
  • This study supports the hypothesis that motor cortex utilizes a muscle-centric framework for generating voluntary movements.