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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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Related Experiment Video

Updated: Oct 15, 2025

The Muscle Cuff Regenerative Peripheral Nerve Interface for the Amplification of Intact Peripheral Nerve Signals
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Directed stimulation with interfascicular interfaces for peripheral nerve stimulation.

Smruta Koppaka1,2,3, Allison Hess-Dunning1,2,3, Dustin J Tyler1,2,3

  • 1Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH, United States of America.

Journal of Neural Engineering
|October 27, 2021
PubMed
Summary
This summary is machine-generated.

Directed interfascicular electrodes, placed between nerve fascicles without penetrating the perineurium, demonstrate selective activation of specific axon populations. This offers a promising alternative to intrafascicular approaches for nerve stimulation.

Keywords:
epineuriuminterfascicular electrodesperineuriumperipheral nerve electrodes

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Neural Engineering

Background:

  • Computational models suggest directional electrical contacts can achieve high selectivity.
  • Current intrafascicular electrodes penetrate the nerve's perineurium, posing risks.
  • Selective nerve stimulation is crucial for advanced neuroprosthetics and therapies.

Purpose of the Study:

  • To test the hypothesis that directed interfascicular electrodes are selective.
  • To evaluate the efficacy of non-penetrating interfascicular contacts in activating specific axon populations.
  • To compare the selectivity of interfascicular interfaces with existing approaches.

Main Methods:

  • Implantation of multiple interfascicular electrodes with directional contacts in rabbit sciatic nerves.
  • Measurement of electromyographic (EMG) activity from key leg muscles using fine-wire electrodes.
  • Analysis of recruitment data to assess selective axon activation.

Main Results:

  • Directed interfascicular interfaces successfully and selectively activated different axon populations.
  • The electrodes did not penetrate the perineurium, confirming the non-invasive nature of the approach.
  • Recruitment data supported the hypothesis of selective stimulation.

Conclusions:

  • Non-penetrating interfascicular interfaces provide selective nerve stimulation.
  • These interfaces represent a viable alternative to intrafascicular electrodes.
  • Interfascicular approaches may offer enhanced selectivity compared to extraneural methods.