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Related Concept Videos

Motor Unit Stimulation01:20

Motor Unit Stimulation

1.6K
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...
1.6K

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Related Experiment Video

Updated: Jul 8, 2025

Author Spotlight: Advancing Spinal Cord Stimulation - Exploring the Cellular Responses of Motor Neurons Through Patch-Clamp Electrophysiology
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Author Spotlight: Advancing Spinal Cord Stimulation - Exploring the Cellular Responses of Motor Neurons Through Patch-Clamp Electrophysiology

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SUPRASPINAL CONTROL OF MOTONEURONS AFTER PARALYSIS ENABLED BY SPINAL CORD STIMULATION.

Josep-Maria Balaguer1,2, Genis Prat-Ortega1,3, Nikhil Verma4

  • 1Rehab and Neural Engineering Labs, University of Pittsburgh, Pittsburgh, US.

Medrxiv : the Preprint Server for Health Sciences
|December 11, 2023
PubMed
Summary

Spinal cord stimulation (SCS) directly activates motor neurons, not by facilitating existing signals. Residual brain input refines this activity, enabling volitional control within limits.

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In Vivo Intracellular Recording of Type-Identified Rat Spinal Motoneurons During Trans-Spinal Direct Current Stimulation
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Methods to Quantify Pharmacologically Induced Alterations in Motor Function in Human Incomplete SCI
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Methods to Quantify Pharmacologically Induced Alterations in Motor Function in Human Incomplete SCI
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Methods to Quantify Pharmacologically Induced Alterations in Motor Function in Human Incomplete SCI

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Motor Control Research

Background:

  • Spinal cord stimulation (SCS) is a promising therapy for restoring motor function after spinal cord injury (SCI) and stroke.
  • Previous hypotheses suggested SCS enhances residual supraspinal inputs to motoneurons.
  • Understanding the precise mechanism of SCS is crucial for optimizing its therapeutic application.

Conclusions:

  • SCS directly activates spinal motoneurons, providing a novel mechanism for motor control restoration.
  • Volitional control of SCS-mediated movements is possible but depends on the interaction with residual supraspinal pathways.
  • The findings highlight the limitations of SCS in severe SCI cases with significant loss of supraspinal connections.