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Cholinergic nerves in the human liver

F Amenta, C Cavallotti, F Ferrante

    The Histochemical Journal
    |May 1, 1981
    PubMed
    Summary

    Researchers investigated the human liver's cholinergic nerves. They found that cholinergic nerve fibers innervate the liver's blood vessels and, to a lesser extent, hepatocytes and sinusoids, indicating parasympathetic innervation.

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    Cholinergic innervation of human mesenteric lymphatic vessels.

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    Area of Science:

    • Neuroscience
    • Gastroenterology
    • Histology

    Background:

    • The liver receives autonomic nerve input, but the specific roles of cholinergic and adrenergic systems are not fully elucidated.
    • Understanding the neural pathways in the liver is crucial for comprehending its physiological functions.

    Purpose of the Study:

    • To investigate the distribution and pattern of cholinergic nerve fibers in the human liver and its associated major blood vessels.
    • To determine if adrenergic denervation affects the cholinergic innervation pattern.

    Main Methods:

    • Human liver and major hepatic blood vessel slices were treated with 6-hydroxydopamine (6-HDA) to selectively degenerate adrenergic nerves.
    • Control slices were incubated in buffer alone.
    • Histochemical staining for cholinesterases was performed on cryosectioned slices to visualize cholinergic nerve fibers.

    Main Results:

    • Cholinergic nerve fibers were identified in both extrahepatic and intrahepatic branches of the hepatic artery, portal vein, and hepatic vein.
    • Fewer cholinergic fibers were observed innervating hepatocytes and hepatic sinusoids.
    • 6-HDA treatment did not significantly alter the observed pattern of cholinergic innervation.

    Conclusions:

    • The human liver possesses a distinct cholinergic innervation pattern, primarily associated with its vascular structures.
    • These findings support the presence of a cholinergic parasympathetic innervation within the human liver.

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