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Recording Vibrissal Compound Muscle Action Potentials Following Facial Nerve Trunk Stimulation in Rats Using a BIOPAC

John Patrick Cuenca1, Min Young Lee1, Jae Yun Jung1

  • 1Department of Otorhinolaryngology-Head and Neck Surgery, College of Medicine, Dankook University, Cheonan, Korea.

Journal of Audiology & Otology
|April 29, 2026
PubMed
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This study presents a reproducible method for recording facial nerve compound muscle action potentials (CMAPs) in rats. This technique offers a practical approach to assess facial nerve injury and recovery in rodent models.

Area of Science:

  • Neuroscience
  • Electrophysiology
  • Surgical Research

Background:

  • Compound muscle action potential (CMAP) recording is crucial for assessing facial nerve function post-injury.
  • Quantitative vibrissal CMAPs in rodents are valuable surrogates for facial nerve integrity.
  • Practical descriptions of CMAP recording setups are limited.

Purpose of the Study:

  • To detail a practical and reproducible method for recording vibrissal CMAPs in rats.
  • To assess facial nerve function following crush injury, transection, and repair using a BIOPAC system.
  • To establish a reliable electrophysiological assessment for experimental facial nerve injury.

Main Methods:

  • Direct stimulation of the facial nerve trunk in rats.
  • Recording vibrissal CMAPs using a BIOPAC-based system before and after unilateral facial nerve injury.
Keywords:
BIOPAC systemCompound muscle action potentialFacial nerveRat modelVibrissal muscle

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  • Utilizing single-peak CMAP amplitude and left/right amplitude ratios for longitudinal assessment and to minimize variability.

    • Main Results:

    • Direct nerve trunk stimulation reliably produced stable CMAP waveforms.
    • CMAPs were absent at 1 week post-injury, reappeared at 2 weeks, and increased by 4 weeks.
    • Left/right amplitude ratios provided a reliable measure of functional recovery due to inter-session variability.

    Conclusions:

    • This BIOPAC-based method provides a straightforward and accessible approach for electrophysiological assessment of facial nerve injury and recovery in rodent models.
    • The described technique enables reliable longitudinal assessment of facial nerve integrity.
    • Vibrissal CMAP recording serves as a quantitative surrogate for evaluating facial nerve function in experimental settings.