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Related Experiment Videos

The respiratory motoneuron and apneusis

T A Sears

    Federation Proceedings
    |September 1, 1977
    PubMed
    Summary

    This study re-evaluates apneusis and the nervous mechanism of breathing, suggesting abandonment of traditional respiratory center terms. New experiments reveal a CO2-dependent excitation of expiratory motoneurons via a direct pathway.

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    Area of Science:

    • Neuroscience
    • Respiratory Physiology

    Background:

    • Historical context of apneusis and its impact on understanding the nervous control of breathing.
    • Critique of established terminology for respiratory centers due to conceptual complexities.

    Purpose of the Study:

    • To investigate expiratory apneusis and the role of carbon dioxide (CO2) in respiratory control.
    • To propose a revised model for the neural mechanisms of breathing.

    Main Methods:

    • Experimental studies involving sagittal brain stem incisions near the obex in animals.
    • Analysis of brain stem-mediated CO2 effects on expiratory motoneurons under steady-state conditions.

    Main Results:

    • Demonstration of CO2-dependent tonic excitation of expiratory motoneurons.
    • Identification of a direct pathway from chemoreceptors to expiratory bulbospinal neurons.

    Conclusions:

    • The findings support a simplified model of CO2-mediated respiratory control.
    • Re-evaluation of the nervous mechanism of breathing and proposed abandonment of outdated terminology.

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