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Teresa Pitts1

  • 1Department of Physiological Sciences, College of Veterinary Medicine, University of Florida, PO Box 100144, Gainesville, FL, 32610-0144, USA, tepitts@ufl.edu.

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Summary
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The pharynx plays a crucial role in airway protection during cough and swallow reflexes. Newly identified thyropharyngeus and cricopharyngeus muscle functions are vital for preventing aspiration pneumonia.

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Area of Science:

  • Physiology
  • Neuroscience
  • Otolaryngology

Background:

  • The pharynx, a shared pathway for air and food, is often overlooked in airway protection.
  • Cough and swallow are critical, coordinated reflexes essential for airway defense.

Purpose of the Study:

  • To investigate the functional roles of the thyropharyngeus and cricopharyngeus muscles in airway protection.
  • To highlight the pharynx's active contribution to respiratory and deglutitive protective mechanisms.

Main Methods:

  • The study describes the physiological responses of the thyropharyngeus and cricopharyngeus muscles.
  • Mechanisms were evaluated in the context of cough and swallow reflexes.

Main Results:

  • The thyropharyngeus muscle creates a temporary holding area for expelled airway material during cough.
  • The cricopharyngeus muscle, with the larynx, regulates pressure during bolus/air transit in both directions.

Conclusions:

  • These newly identified pharyngeal mechanisms are vital for airway protection.
  • Impairment of these functions may contribute to aspiration pneumonia, particularly in neurodegenerative diseases.
  • Further research in healthy and patient populations is warranted to fully understand these mechanisms.