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Thyroid cartilage movements during breathing

T C Amis1, A Brancatisano, A Tully

  • 1Department of Respiratory Medicine, Westmead Hospital, New South Wales, Australia.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|February 1, 1995
PubMed
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Thyroid cartilage displacement (TCD) during breathing in dogs is driven by cricothyroid and posterior cricoarytenoid muscles. These muscles, innervated by the superior laryngeal nerve, control laryngeal and hypopharyngeal dilation.

Area of Science:

  • Respiratory Physiology
  • Laryngeal Biomechanics

Background:

  • Thyroid cartilage displacement (TCD) is a key indicator of laryngeal function during respiration.
  • Understanding the muscular control of TCD is crucial for diagnosing and treating respiratory disorders.

Purpose of the Study:

  • To investigate the muscular mechanisms underlying inspiratory thyroid cartilage displacement (TCD) during tidal breathing.
  • To determine the roles of the cricothyroid (CT) and posterior cricoarytenoid (PCA) muscles in TCD.

Main Methods:

  • Measurements of lateral TCD in anesthetized dogs using linear transducers.
  • Electromyography (EMG) to record CT and PCA muscle activity.
  • Nerve stimulation (superior laryngeal nerve - ExSLN, recurrent laryngeal nerve - RLN) and nerve section experiments.

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Main Results:

  • Phasic inspiratory TCD correlated with CT and PCA muscle activity during tidal breathing.
  • Tracheal occlusion significantly increased TCD and muscle activity.
  • ExSLN stimulation caused greater TCD than RLN stimulation; ExSLN section reduced TCD.

Conclusions:

  • Both CT and RLN-innervated muscles, likely including the PCA, contribute to TCD during breathing.
  • Inspiratory hypopharyngeal dilation is mediated by CT and PCA muscle contractions.