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Related Experiment Videos

Respiratory changes in nasal muscle length.

E van Lunteren, M A Haxhiu, N S Cherniack

    Journal of Applied Physiology (Bethesda, Md. : 1985)
    |August 1, 1985
    PubMed
    Summary

    The alae nasi muscle shortens during inspiration, closely mirroring electromyographic (EMG) activity. Vagal nerve signals significantly inhibit this nasal dilating muscle

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    Area of Science:

    • Respiratory Physiology
    • Muscle Physiology

    Background:

    • The alae nasi muscle plays a role in nasal airflow during breathing.
    • Understanding its function requires examining its mechanical and electrical activity patterns.

    Purpose of the Study:

    • To investigate the temporal relationship between alae nasi muscle shortening and electromyographic (EMG) activity during respiration.
    • To determine the influence of airway occlusion and vagal feedback on alae nasi muscle function.

    Main Methods:

    • Sonomicrometry was used to measure alae nasi muscle length changes in anesthetized dogs.
    • Electromyographic (EMG) activity of the alae nasi muscle was recorded simultaneously.
    • Airway occlusions and lung volume changes were manipulated to assess neural control.

    Main Results:

    • Alae nasi muscle demonstrated inspiratory shortening, preceding inspiratory flow.
    • Muscle shortening patterns closely correlated with EMG activity patterns.
    • Vagal afferents mediated significant inhibition of alae nasi shortening, synchronized with EMG inhibition.

    Conclusions:

    • The electromyographic (EMG) activity pattern accurately reflects the inspiratory shortening of the alae nasi muscle.
    • Vagal nerve pathways exert substantial inhibitory control over the alae nasi muscle's inspiratory activity.

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