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Bulbar inhibition of spinal and supraspinal sympathetic reflex discharges

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Summary

  1. 1.

    In chloralose anesthetized cats, the sympathetic reflex discharge was recorded from the renal sympathetic nerve.

  2. 2.

    The early-spinal and late-supraspinal sympathetic reflex discharges were elicited by single electrical stimulation of the thoracic dorsal roots.

  3. 3.

    Increased excitation of the baroceptor afferents produced by a rise of blood pressure after injection of noradrenaline caused strong inhibitition of the latesupraspinal reflex discharge. The early-spinal reflex discharge was only rarely affected.

  4. 4.

    Electrical stimulation of the medullary depressor area caused inhibition of the spinal and supraspinal reflex discharges.

  5. 5.

    It is concluded that spinal reflex pathways receive some inhibitory descending influences from the medulla oblongata.

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Author notes

  1. A. Sato

    Present address: II Physiologisches Institut der Universität Heidelberg, Heidelberg, Deutschland

  2. H. Weidinger

    Present address: Frauenklinik der Universität Heidelberg im Klinikum Mannheim, Heidelberg, Deutschland

Authors and Affiliations

  1. I. Physiologisches Institut der Universität Heidelberg, Heidelberg, Germany

    F. Kirchner, A. Sato & H. Weidinger

Authors
  1. F. Kirchner
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  2. A. Sato
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  3. H. Weidinger
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Additional information

This work was supported by the Deutsche Forschungsgemeinschaft.

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Kirchner, F., Sato, A. & Weidinger, H. Bulbar inhibition of spinal and supraspinal sympathetic reflex discharges. Pflugers Arch. 326, 324–333 (1971). https://doi.org/10.1007/BF00586996

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  • DOI: https://doi.org/10.1007/BF00586996

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