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Sympathetic innervation of the urinary bladder.

E Fehér, J Vajda

    Acta Morphologica Academiae Scientiarum Hungaricae
    |January 1, 1981
    PubMed
    Summary

    Sympathetic nerves in the urinary bladder originate from hypogastric ganglia and short adrenergic neurons. These nerves modulate local ganglia, blood supply, and directly affect smooth muscle cells.

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    Area of Science:

    • Urology
    • Neuroscience
    • Anatomy

    Background:

    • The sympathetic nervous system plays a crucial role in regulating bladder function.
    • Understanding the precise origin and pathways of sympathetic innervation is essential for comprehending bladder control.

    Purpose of the Study:

    • To investigate the origin and distribution of sympathetic nerve fibers innervating the urinary bladder.
    • To differentiate the roles of extrinsic and intrinsic sympathetic neurons in bladder function.

    Main Methods:

    • Utilized fluorescence microscopy with glyoxylic acid methods and electron microscopy.
    • Studied normal bladders, bladders after hypogastric ganglia extirpation, and after 6-hydroxydopamine administration.

    Main Results:

    • Identified adrenergic fibers associated with blood/lymph vessels, muscle layers, and local nerve cells in normal bladders.
    • Observed degenerated axons in ganglia and connective tissue post-extirpation, with remaining fibers in muscle layers.
    • 6-hydroxydopamine treatment eliminated fluorescence, indicating adrenergic nature; degenerated fibers near smooth muscle suggested direct innervation.

    Conclusions:

    • Sympathetic innervation of the urinary bladder comprises two main components.
    • One component originates from hypogastric ganglia, influencing local ganglia and bladder vasculature.
    • The other component arises from short adrenergic neurons, directly innervating bladder smooth muscle cells.

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