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Vol. 83, Issue 5, 1588-1594, 1997
Department of Internal Medicine, The University of Texas Medical Branch, Galveston, Texas 77555-0561
Received 20 February 1997; accepted in final form 8 July 1997.
Kuna, Samuel T., and Christi R. Vanoye.
Respiratory-related pharyngeal constrictor muscle activity in
decerebrate cats. J. Appl. Physiol.
83(5): 1588-1594, 1997.
Respiratory-related activity of the
hyopharyngeus (middle pharyngeal constrictor) and thyropharyngeus
(inferior pharyngeal constrictor) muscles was determined in
decerebrate, tracheotomized adult cats and compared with the
electromyographic activity of the thyroarytenoid, a vocal cord
adductor. During quiet breathing, the hyopharyngeus and usually the
thyroarytenoid exhibited phasic activity during expiration and tonic
activity throughout the respiratory cycle. Respiratory-related thyropharyngeus activity was absent under these conditions. Progressive hyperoxic hypercapnia and progressive isocapnic hypoxia increased phasic expiratory activity in both pharyngeal constrictor (PC) muscles
but tended to suppress thyroarytenoid activity. Passively induced
hypocapnia and the central apnea that followed the cessation of the
mechanical hyperventilation were associated with tonic activation of
the hyopharyngeus and thyroarytenoid but no recruitment in
thyropharyngeus activity. The expiratory phase of a sigh and progressive pneumothorax were associated with an increase in phasic thyroarytenoid activity but no change in phasic PC activity. The results indicate that a variety of stimuli modulate respiratory-related PC activity, suggesting that the PC muscles may have a role in the
regulation of upper airway patency during respiration.
hyopharyngeus; thyropharyngeus; thryoarytenoid; transversus abdominis; electromyograms
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