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Sympathetic rhythms in spinal cats

P M Gootman, M I Cohen

    Journal of the Autonomic Nervous System
    |April 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    Brainstem input synchronizes sympathetic nerve activity across spinal levels. Transection disrupts this rhythm, indicating brainstem control over sympathetic nerve oscillations.

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    Area of Science:

    • Neuroscience
    • Autonomic Nervous System Research
    • Physiology

    Background:

    • Simultaneous recordings of preganglionic sympathetic nerves (cervical sympathetic and greater splanchnic) show common periodicities (cardiac, respiratory, 10/sec).
    • These common rhythms suggest either shared periodic inputs or spinal cord feedback connections between neuronal groups.

    Purpose of the Study:

    • To differentiate between common periodic inputs and spinal cord feedback mechanisms influencing sympathetic nerve synchrony.
    • To investigate the role of the brainstem in coordinating sympathetic activity across different spinal levels.

    Main Methods:

    • Performed spinal cord transections at C2-C3 in decerebrate, unanesthetized cats.
    • Recorded sympathetic nerve activity and analyzed periodicities using cross-correlation and power spectral analysis.

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  • Induced sympathetic nerve activity changes via asphyxia and strychnine administration.

    • Main Results:

    • Spinal cord transection abolished periodic activity in sympathetic nerves.
    • Asphyxia induced sympathetic nerve oscillations but failed to synchronize cervical sympathetic and splanchnic activity.
    • Strychnine caused slow-scale (1-5 sec) synchronization across phrenic, cervical sympathetic, and splanchnic nerves, but not fast-scale (100-500 msec) synchrony observed in intact animals.

    Conclusions:

    • Oscillations in sympathetic activity can occur at the spinal cord level.
    • The synchrony of sympathetic nerve activity across different spinal segments relies on input from the brainstem.