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Related Experiment Videos

The diaphragm: two muscles

A De Troyer, M Sampson, S Sigrist

    Science (New York, N.Y.)
    |July 10, 1981
    PubMed
    Summary
    This summary is machine-generated.

    The diaphragm has two distinct parts: the costal and crural. Each part influences rib cage dimensions differently, suggesting separate muscular functions in breathing mechanics.

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    Area of Science:

    • Respiratory Physiology
    • Comparative Anatomy

    Background:

    • The diaphragm is a primary muscle of respiration.
    • Its distinct anatomical parts may have specialized functions.

    Purpose of the Study:

    • To investigate the independent effects of the costal and crural diaphragm parts on rib cage dimensions.
    • To determine if these parts act as separate functional units.

    Main Methods:

    • Separate electrical stimulation of the costal and crural portions of the diaphragm.
    • Measurements of lower rib cage dimensions in anesthetized dogs.

    Main Results:

    • Costal diaphragm stimulation led to an increase in lower rib cage dimensions.
    • Crural diaphragm stimulation resulted in a decrease in lower rib cage dimensions.

    Conclusions:

    • The diaphragm comprises functionally distinct muscular components.
    • The costal and crural parts exert opposing effects on the rib cage, indicating separate roles in respiratory mechanics.