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J Appl Physiol (July 19, 2002). doi:10.1152/japplphysiol.00417.2002
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Articles in PresS, published online ahead of print July 19, 2002
J Appl Physiol, 10.1152/jap.00417.2002
Submitted on May 14, 2002
Accepted on July 17, 2002

Mucosal Afferents Mediate Laryngeal Adductor Responses in the Cat

Richard D Andreatta1*, Eric A Mann1, Christopher J Poletto1, and Christy L Ludlow1

1 Laryngeal & Speech Section, National Institutes of Health - NINDS, Bethesda, MD, USA

* To whom correspondence should be addressed. E-mail: andreatt{at}coe.uga.edu.

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 8 anesthetized cats. The same displacements were delivered both before and after surgical excision of the overlying mucosa. With the mucosa intact, early R1 LAR responses recorded from the thyroarytenoid (TA) 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 TA muscle recording sites (p<0.0005). These findings demonstrate that mucosal mechanoreceptors and not proprioceptive afferents contribute to the elicitation of LAR responses in the cat.




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