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Related Experiment Videos

Accessory muscle activity and respiration.

B G Ellenbogen, T G Gerber, R L Coon

    Otolaryngology--Head and Neck Surgery : Official Journal of American Academy of Otolaryngology-Head and Neck Surgery
    |May 1, 1981
    PubMed
    Summary
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    Accessory respiratory muscles, sternothyroid and sternohyoid, show varied activity during breathing. Sternothyroid muscles activate with inspiration, while sternohyoid activity is minimal, even under induced hypoxia.

    Area of Science:

    • Respiratory Physiology
    • Comparative Anatomy
    • Neuroscience

    Background:

    • Accessory muscles of respiration play a crucial role in breathing mechanics.
    • Understanding the specific roles of sternohyoid and sternothyroid muscles is vital for respiratory research.
    • Canine and primate respiratory systems present anatomical differences, necessitating comparative studies.

    Purpose of the Study:

    • To investigate the relationship between accessory muscle activity (sternohyoid and sternothyroid) and respiration in canines.
    • To compare accessory muscle activity in canines with that of primates, specifically chair-trained monkeys.
    • To determine the influence of nerve sectioning, hypoxia, and hypercarbia on accessory muscle function.

    Main Methods:

    • Electromyographic recordings of sternohyoid and sternothyroid muscle activity in canines.

    Related Experiment Videos

  • Similar recordings were performed in chair-trained monkeys with intact and sectioned recurrent laryngeal nerves.
  • Induction of hypoxia and hypercarbia in canines, and partial airway obstruction and hypoxia in monkeys.

    • Main Results:

    • In canines, sternothyroid muscles exhibited spontaneous activity with inspiration; sternohyoid showed no similar activity.
    • After recurrent laryngeal nerve sectioning and inducing hypoxia/hypercarbia, both muscles showed some activity, with negligible sternohyoid activity in severe hypoxia.
    • Monkeys displayed consistent omohyoid and sternothyroid activity during induced airway obstruction and hypoxia, but not consistent sternohyoid activity.

    Conclusions:

    • Sternothyroid muscle is actively involved in canine respiration, while sternohyoid plays a minimal role.
    • Primate accessory muscle activity, particularly sternohyoid, is less consistent during normal and stressed respiration compared to sternothyroid and omohyoid.
    • Nerve integrity and specific respiratory challenges significantly influence accessory muscle recruitment patterns.