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J Appl Physiol 83: 89-94, 1997;
8750-7587/97 $5.00
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Journal of Applied Physiology
Vol. 83, No. 1, pp. 89-94, July 1997
CONTROL OF BREATHING, CIRCULATION, AND TEMPERATURE

Motor innervation of the cricopharyngeus muscle by the recurrent laryngeal nerve

Carol Smith Hammond, Paul W. Davenport, Alastair Hutchison, and Randall A. Otto

Departments of Communication Processes and Disorders, Physiological Sciences, and Pediatrics, University of Florida, Gainesville, Florida 32610; and Department of Otolaryngology, University of Texas at San Antonio, San Antonio, Texas 78285

Received 9 July 1996; accepted in final form 27 February 1997.

Hammond, Carol Smith, Paul W. Davenport, Alastair Hutchison, and Randall A. Otto. Motor innervation of the cricopharyngeus muscle by the recurrent laryngeal nerve. J. Appl. Physiol. 83(1): 89-94, 1997.---Patients with recurrent laryngeal nerve (RLN) paresis demonstrate impaired function of laryngeal muscles and swallowing. The cricopharyngeus muscle (CPM) is a major component of the upper esophageal sphincter. It was hypothesized that the RLN innervates this muscle. A nerve branch leading from the RLN to the CPM was found in adult sheep by anatomic dissection. Electrical stimulation of the RLN elicited a muscle action potential recorded by electrodes placed in the ipsilateral CPM. Swallowing was investigated by mechanical stimulation of oropharynx pre- and postsectioning of the RLN. Severing of the RLN resulted in a loss of the early phases of swallow-related CPM electromyographic activity; however, late-phase CPM electromyographic activity persisted. The RLN provides motor innervation of the CPM, which also has innervation from the pharyngeal plexus.

swallow; esophageal reflux; glottis

0161-7567/97 $5.00 Copyright © 1997 the American Physiological Society






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