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Related Experiment Videos

The effects of sacral denervation on bladder and urethral function.

E J McGuire, F C Wagner

    Surgery, Gynecology & Obstetrics
    |March 1, 1977
    PubMed
    Summary

    Complete sacral denervation impairs anal and urethral skeletal muscle function, but not smooth muscle tone. Spinal anesthesia affects smooth muscle, highlighting the sympathetic nervous system

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    Area of Science:

    • Neuroscience
    • Urology

    Background:

    • Urinary continence relies on complex neuromuscular control.
    • The roles of different nerve pathways in maintaining bladder and urethral function require further elucidation.

    Purpose of the Study:

    • To investigate the impact of sacral denervation and spinal anesthesia on urinary continence mechanisms.
    • To determine the specific roles of skeletal and smooth muscle activity in maintaining urethral sphincter function.

    Main Methods:

    • Assessment of anal sphincter, detrusor, and urethral skeletal and smooth muscle activity following complete sacral denervation.
    • Evaluation of voiding responses to Credé and Valsalva maneuvers post-denervation.
    • Analysis of urethral smooth muscle activity under spinal anesthesia.

    Main Results:

    • Sacral denervation abolished anal sphincter, detrusor, and urethral skeletal muscle activity.
    • Resting urethral smooth muscle sphincter tone remained unaffected by sacral denervation.
    • Credé and Valsalva maneuvers failed to induce voiding after denervation.
    • Spinal anesthesia led to a loss of urethral smooth muscle activity.

    Conclusions:

    • Intact sympathetic nerve supply is crucial for maintaining urinary continence.
    • Urethral skeletal muscle activity is dependent on sacral innervation.
    • Urethral smooth muscle tone is maintained by a different neural pathway, susceptible to spinal anesthesia.

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