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Related Experiment Videos

The adrenergic component in the proximal urethra

S A Awad, J W Downie

    Urologia Internationalis
    |January 1, 1977
    PubMed
    Summary

    Sympathetic nerves significantly impact urinary continence by controlling urethral smooth muscle tension. Nerve stimulation caused constriction, while sectioning led to earlier and wider urethral opening under stress.

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    Area of Science:

    • Urology
    • Neuroscience
    • Physiology

    Background:

    • Understanding urethral function is crucial for managing urinary incontinence.
    • The role of the sympathetic nervous system in urethral smooth muscle control requires further elucidation.

    Purpose of the Study:

    • To investigate the influence of sympathetic nerve stimulation and blockade on proximal urethral function.
    • To assess the contribution of the sympathetic nervous system to urethral wall tension and urinary continence.

    Main Methods:

    • Developed two experimental systems for simultaneous radiological and perfusion pressure monitoring of urethral function.
    • Administered pharmacological agents (noradrenaline, isoprenaline) and performed nerve stimulation (hypogastric nerve).
    • Utilized a stress cystogram model and performed hypogastric nerve section to evaluate urethral response to stress.

    Main Results:

    • Hypogastric nerve stimulation and noradrenaline induced urethral constriction; isoprenaline caused dilatation.
    • Hypogastric nerve section resulted in earlier and wider urethral opening under stress conditions.
    • The sympathetic nervous system's influence on urethral opening was more significant than parasympathetic or somatic pathways.

    Conclusions:

    • Sympathetically innervated smooth muscle plays a critical role in maintaining urinary continence.
    • The sympathetic nervous system significantly influences urethral wall tension.
    • Findings highlight the importance of sympathetic control for normal urethral function.

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