Novel model to assess laryngeal function, innervation, and reinnervation

Area of Science:

• Veterinary Neurology
• Laryngology
• Animal Models

Background:

• Laryngeal paralysis is a significant clinical challenge.
• Understanding laryngeal muscle behavior post-injury requires studying denervation and reinnervation.
• Existing models may lack the reliability and accuracy needed for comprehensive study.

Purpose of the Study:

• To develop a robust and precise animal model for investigating laryngeal function.
• To facilitate the study of laryngeal innervation and reinnervation processes.
• To create a reproducible platform for laryngeal nerve research.

Main Methods:

• Developed a spontaneous-breathing anesthesia technique and suspension laryngoscopy for rat larynx evaluation.
• Utilized transoral injection of retrograde neuronal tracer (FluoroGold) for neural mapping.
• Applied the technique to 14 rats to map brainstem projections of laryngeal nerves.

Main Results:

• The endoscopic technique enabled complete evaluation of the rat larynx.
• Successfully mapped neural projections of the superior laryngeal nerve, recurrent laryngeal nerve, and cervical ganglia.
• Demonstrated feasibility and accuracy of endoscopic injection for neural tracing.

Conclusions:

• A reliable and accurate model for characterizing laryngeal function and innervation has been established.
• The model is suitable for studying spontaneous reinnervation after recurrent laryngeal nerve resection.
• This reproducible model serves as a valuable tool for future laryngeal nerve injury research.