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Effects Of Denervation On Laryngeal Muscles: A Canine Model

M. Shindo, G. Herzon, D. Hanson, D. Cain, V. Sahgal
Published 1992 · Medicine

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The purpose of this study was to chronologically evaluate the changes in function and histomorphometry of denervated laryngeal muscles. In 14 adult mongrel dogs, a 2.5‐cm segment of the right recurrent laryngeal nerve was excised. Videolaryngoscopy and electromyography were performed at 1, 2, 3, 4, 5, 6, and 9 months under intravenous sedation. The animals were then killed, and the laryngeal muscles were processed for histochemical reactions. The mean muscle fiber diameter, standard deviation, and muscle fiber type composition were determined. The findings indicate that, following recurrent laryngeal nerve sectioning, the canine intrinsic laryngeal muscles undergo denervation atrophy for approximately 3 months, after which reinnervation occurs. The source of reinnervation appears to be from regenerated nerve fibers of the sectioned recurrent laryngeal nerve. The nerve fibers nonselectively reinnervated the abductor and adductor muscles of the larynx.



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