Mucosal afferents mediate laryngeal adductor responses in the cat

Richard D. Andreatta, Eric A. Mann, Christopher J. Poletto, Christy L. Ludlow

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

Laryngeal adductor responses (LAR) close the airway in response to stimulation of peripheral afferents in the superior laryngeal nerve. Although both mucosal afferents and proprioceptive receptors are present in the larynx, their relative contribution for reflex elicitation is unknown. Our purpose was to determine which receptor types are of importance in eliciting the LAR. A servomotor with displacement feedback was used to deliver punctate displacements to the body of the arytenoid cartilage and overlying mucosa on each side of the larynx in eight anesthetized cats. The same displacements were delivered both before and after surgical excision of the overlying mucosa. With the mucosa intact, early short-latency component R1 LAR responses recorded from the thyroarytenoid muscles were frequent (ipsilateral > 92%, contralateral > 95%). After the mucosa was removed, the LAR became infrequent (<3%) and was reduced in amplitude in both the ipsilateral and contralateral thyroarytenoid muscle recording sites (P < 0.0005). These findings demonstrate that mucosal mechano-receptors and not proprioceptive afferents contribute to the elicitation of LAR responses in the cat.

Original languageEnglish
Pages (from-to)1622-1629
Number of pages8
JournalJournal of Applied Physiology
Volume93
Issue number5
DOIs
StatePublished - Nov 1 2002

Keywords

  • Electromyogram
  • Sensorimotor
  • Servomotor displacement
  • Thyroarytenoid

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

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