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Related Experiment Videos

Cricothyroid muscle in respiration.

M Horiuchi, C T Sasaki

    The Annals of Otology, Rhinology, and Laryngology
    |May 1, 1978
    PubMed
    Summary

    The cricothyroid muscle, known for phonation, significantly regulates breathing by controlling expiratory airflow and resistance. Its activity modifies respiration rate via laryngeal adjustments, responding to pressure changes and vagal stimuli.

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    Area of Science:

    • Respiratory physiology
    • Laryngeal biomechanics

    Background:

    • The cricothyroid muscle's role in breathing is often overlooked.
    • It is primarily recognized for its function in voice production (phonation).

    Purpose of the Study:

    • To highlight the unrecognized respiratory function of the cricothyroid muscle.
    • To elucidate its role in regulating breathing through expiratory control.

    Main Methods:

    • Investigated the mechanical effects of cricothyroid muscle contraction during expiration.
    • Examined the muscle's response to pressure changes and vagal nerve input.
    • Analyzed the influence of hypercapnia and hypocapnia on cricothyroid activation thresholds.

    Main Results:

    • Cricothyroid contraction during expiration increases glottic size, reducing airway resistance and expiratory duration.
    • This mechanism allows modification of respiration rate, positioning the larynx as a key respiratory effector.
    • Cricothyroid activity is a pressure-sensitive response triggered by subglottic pressure, influenced by vagal stimuli.
    • Activation thresholds are modulated by blood carbon dioxide levels, decreasing in hypercapnia and increasing in hypocapnia.

    Conclusions:

    • The cricothyroid muscle plays a crucial role in breathing regulation by controlling expiratory resistance and flow.
    • The larynx, via the cricothyroid muscle, acts as a principal effector in modifying respiratory rate.
    • Understanding this muscle's respiratory function is vital for respiratory physiology and clinical applications.

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