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Changes in vesical function produced by cutaneous stimulation in rats.

A Sato, Y Sato, F Shimada

    Brain Research
    |September 5, 1975
    PubMed
    Summary
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    Perineal skin stimulation triggers bladder contractions via a spinal reflex in rats. However, intense stimulation can inhibit rhythmic bladder contractions, suggesting complex neural control of micturition.

    Area of Science:

    • Neuroscience
    • Urology

    Background:

    • The neural control of bladder function is complex, involving both central and peripheral pathways.
    • Understanding reflexes that influence bladder activity is crucial for diagnosing and treating urinary disorders.

    Purpose of the Study:

    • To investigate the effects of stimulating various skin areas on bladder function in rats.
    • To elucidate the neural mechanisms underlying bladder responses to somatic stimulation.

    Main Methods:

    • Experiments were conducted on anesthetized rats with intact central nervous system (CNS), decerebrated rats, and spinal rats.
    • Bladder tone and contractions were measured using the intravesical balloon method.
    • Tactile and nociceptive stimulation of the perineal skin was applied.

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    Main Results:

    • Tactile or nociceptive perineal stimulation induced small bladder contractions, a response mediated by a propriospinal reflex involving pelvic nerves, present even after spinal transection.
    • High intravesical pressure (200 mm H2O) normally elicits large rhythmic bladder contractions (micturition contractions) driven by pelvic nerve activity.
    • Perineal stimulation inhibited these large contractions by suppressing rhythmic pelvic nerve discharges, while still causing a smaller excitatory response.

    Conclusions:

    • The bladder's response to perineal stimulation involves both excitatory (propriospinal) and inhibitory (descending) pathways.
    • The findings highlight the intricate neural circuitry regulating bladder function and micturition reflexes.