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Related Experiment Videos

Baroreceptor influence on a spinal cardiovascular reflex.

F Lioy, P M Szeto

    Canadian Journal of Physiology and Pharmacology
    |February 1, 1979
    PubMed
    Summary

    Stretching the thoracic aorta triggers cardiovascular reflexes, even after spinal cord injury. Baroreceptor input partially inhibits this spinal reflex, revealing a key interaction in blood pressure regulation.

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    Area of Science:

    • Cardiovascular Physiology
    • Neuroscience

    Background:

    • The thoracic aorta plays a role in cardiovascular reflexes.
    • Spinal cardiovascular reflexes are not fully understood.
    • Baroreceptor input is known to influence cardiovascular function.

    Purpose of the Study:

    • To investigate the role of the thoracic aorta in spinal cardiovascular reflexes.
    • To determine the influence of baroreceptor input on aortic reflexes.
    • To elucidate the inhibitory control of baroreceptors on spinal cardiovascular reflexes.

    Main Methods:

    • Vagotomized cats were used under chloralose-urethane anesthesia.
    • Aortic flow was maintained while stretching the thoracic aorta.
    • Carotid sinus pressure was manipulated, and carotid sinus nerve was stimulated.
    • Aortic nerve sectioning was performed.

    Main Results:

    • Thoracic aorta stretch induced a reflex increase in mean arterial pressure (29 +/- 2 mmHg).
    • Increased carotid sinus pressure or nerve stimulation reduced the aortic stretch reflex response.
    • Maximal baroreceptor stimulation decreased the reflex response by 42%.

    Conclusions:

    • A spinal cardiovascular reflex is elicited by thoracic aorta stretch.
    • Baroreceptor input exerts inhibitory control over this spinal reflex.
    • This study highlights the interaction between baroreceptor and spinal pathways in cardiovascular regulation.

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