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Facial Nerve Surgery in the Rat Model to Study Axonal Inhibition and Regeneration
Published on: May 5, 2020
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Trigeminal Sensory Supply Is Essential for Motor Recovery after Facial Nerve Injury
Svenja Rink-Notzon1, Jannika Reuscher2, Klaus Nohroudi3
1Department of Prosthetic Dentistry, School of Dental and Oral Medicine, University of Cologne, 50931 Cologne, Germany.
International Journal of Molecular Sciences
|December 11, 2022
Summary
Facial nerve injury impairs mimic function recovery. Stimulating trigeminal sensory input to facial motoneurons enhances nerve regeneration and improves motor performance after facial nerve repair.
Area of Science:
- Neuroscience
- Regenerative Medicine
- Motor Neuron Research
Background:
- Facial nerve transection leads to poor recovery of mimic function.
- Regenerating motor nerve fibers face challenges like poor navigation, collateral branching, axonal crosstalk, and insufficient synaptic input.
- Axotomized facial motoneurons become hyperexcitable yet unable to discharge, hindering functional recovery.
Purpose of the Study:
- To investigate methods to improve mimic function recovery after facial nerve injury.
- To test the hypothesis that intensifying trigeminal sensory input can enhance reinnervation specificity.
- To evaluate the impact of trigeminal sensory stimulation on facial motoneuron activity and target reinnervation.
Main Methods:
- Comparison of behavioral, functional, and morphological outcomes after facial nerve reconstructive surgery alone versus combined with trigeminal nerve stimulation.
- Utilized direct or indirect stimulation of the ipsilateral infraorbital nerve.
- Assessed outcomes using vibrissal hair stimulation and manual whisker pad stimulation.
Main Results:
- Both methods of trigeminal sensory stimulation (vibrissal hair and whisker pad) demonstrated beneficial effects.
- Enhanced quality of target reinnervation was observed.
- Improved recovery of vibrissal motor performance was achieved.
Conclusions:
- Intensifying trigeminal sensory input to axotomized facial motoneurons improves reinnervation specificity.
- Trigeminal sensory stimulation is a promising strategy to enhance functional recovery after facial nerve injury.
- This approach offers a novel therapeutic avenue for improving facial mimicry and motor control post-injury.
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