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Related Experiment Videos

Airway receptors.

J Widdicombe1

  • 1Human Physiology and Aerospace Medicine, GKT School of Biomedical Sciences, Shepherd's House, Guy's Campus, London Bridge, SE1 9RT, London, UK. johnwiddicombe@aol.com

Respiration Physiology
|March 10, 2001
PubMed
Summary
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Airway sensory receptors, including those in the larynx and trachea, are numerous but poorly correlated with specific afferent activities. Further research is needed to map these airway sensory structures and their reflex actions.

Area of Science:

  • Respiratory physiology
  • Neuroscience
  • Anatomy

Background:

  • The airways contain various afferent receptors, including pressure, cold, irritant, and C-fibre receptors in the larynx, and slowly and rapidly adapting stretch receptors (SARs and RARs), C-fibre receptors, and neuroepithelial bodies (NEBs) in the trachea and bronchi.
  • While histological identification of sensory structures is advanced, their correlation with specific afferent activities and reflex responses remains poor.

Purpose of the Study:

  • To review the current understanding of airway afferent receptors and their associated sensory structures.
  • To highlight the discrepancies between identified sensory structures and their physiological functions in the larynx, trachea, and bronchi.

Main Methods:

  • Review of existing literature on airway sensory receptors.

Related Experiment Videos

  • Analysis of histological and physiological data correlating sensory structures with afferent discharges and reflex responses.
  • Main Results:

    • In the larynx, four or more sensory structures lack definitive identification with afferent discharges and reflex responses.
    • In the trachea and bronchi, only SARs are clearly identified morphologically and physiologically.
    • Reflexes and afferent discharges from RARs and C-fibre receptors are understood, with some sensory terminals in the epithelium, but receptor complexes are not fully mapped.
    • Nerves in NEBs are identified, but their local and central reflex actions are not elucidated.

    Conclusions:

    • There is a significant gap in definitively linking identified airway sensory structures to their specific physiological roles and reflex actions.
    • Further research is required to map receptor complexes and elucidate the reflex actions of NEB nerves for a comprehensive understanding of airway sensory innervation.