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Related Experiment Videos

Respiratory fluctuations in pupil size.

P Borgdorff

    The American Journal of Physiology
    |April 1, 1975
    PubMed
    Summary

    Pupil size fluctuations in cats are linked to breathing patterns, not sympathetic nerves. These respiratory-driven pupil movements originate from central breathing and blood pressure changes.

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    Area of Science:

    • Neuroscience
    • Physiology

    Background:

    • Pupil size naturally fluctuates.
    • Understanding these fluctuations can reveal insights into autonomic nervous system control.

    Purpose of the Study:

    • To investigate the properties, nervous pathways, and origin of regular pupil size oscillations in cats.
    • To determine the relationship between pupil movements and respiratory cycles.

    Main Methods:

    • Measured pupil size fluctuations in cats under various anesthesia levels.
    • Investigated the role of sympathetic and parasympathetic innervation.
    • Examined the influence of central respiratory activity, blood pressure, and lung mechanics.

    Main Results:

    • Pupil movements were synchronized with respiratory cycles in lightly anesthetized cats.
    • Fluctuations were independent of sympathetic activity but linked to parasympathetic outflow.
    • Identified central respiratory activity and blood pressure variations as key sources of pupil oscillations.

    Conclusions:

    • Respiratory activity significantly influences pupil size.
    • Pupil oscillations likely share origins with other respiratory-related phenomena in the body.
    • Parasympathetic pathways play a crucial role in mediating these pupil size changes.

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