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Related Experiment Videos

Central neural influence on precapillary microvessels and sphincter.

S Baez, S M Feldman, P M Gootman

    The American Journal of Physiology
    |July 1, 1977
    PubMed
    Summary

    Central nervous system (CNS) stimulation constricts arterioles and precapillary sphincters, increasing vasomotion. This indicates CNS actively regulates local blood flow via microcirculation control.

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    Area of Science:

    • Physiology
    • Neuroscience
    • Microcirculation

    Background:

    • The central nervous system (CNS) influences cardiovascular function.
    • Understanding microcirculatory responses to CNS stimulation is crucial for comprehending local blood flow regulation.

    Purpose of the Study:

    • To investigate the effects of CNS stimulation on arterioles and precapillary sphincters.
    • To determine the gradient of microcirculatory responses to CNS stimulation across different vessel sizes.

    Main Methods:

    • Stimulation of vasoactive sites in rat mesoappendix and/or cremaster using indwelling electrodes under anesthesia.
    • Measurement of responses in consecutive arteriolar segments down to the precapillary sphincter.

    Main Results:

    • CNS stimulation elevated blood pressure and constricted precapillary vessels and sphincters.
    • A threefold increase in vasomotion rate of precapillary sphincters and metarterioles was observed.
    • A negative relationship was found between vessel size and the gradient of response to CNS stimulation.

    Conclusions:

    • CNS stimulation actively participates in regulating local blood flow through microcirculation.
    • No independent neural regulation of the precapillary sphincter was found, suggesting integrated arteriolar control.

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