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Excitation conduction in Meissner's plexus of rabbit small intestine

S Yokoyama, T Ozaki, T Kajitsuka

    The American Journal of Physiology
    |February 1, 1977
    PubMed

    Insights

    Nerve impulses in the rabbit

    Area of Science:

    • Neuroscience
    • Gastroenterology
    • Physiology

    Background:

    • The Meissner's plexus is a critical component of the enteric nervous system, regulating gastrointestinal function.
    • Understanding excitation conduction within this plexus is essential for comprehending gut motility and signaling.

    Purpose of the Study:

    • To investigate the characteristics of excitation conduction in the Meissner's plexus of the rabbit small intestine.
    • To determine nerve impulse conduction velocities and chronaxie within the plexus.

    Main Methods:

    • Electrophysiological recordings of evoked potentials in the Meissner's plexus following electrical stimulation.
    • Experiments conducted on isolated segments of rabbit small intestine, with specific muscle layers removed.
    • Analysis of conduction velocity, latency, amplitude, and response to varying stimulation frequencies, pharmacological agents, and hypoxia.

    Main Results:

    • Conduction velocities ranged from 0.3-0.7 m/s, with a nerve bundle chronaxie of 0.06-0.12 ms.
    • Increased distance between electrodes prolonged latency, increased potential number, and decreased amplitude, with no recording beyond 4 mm.
    • High-frequency stimulation, hexamethonium, and hypoxia reduced or abolished evoked potentials at longer conduction distances.

    Conclusions:

    • Nerve impulses spread through multiple pathways within the Meissner's plexus.
    • Synaptic transmission occurs over relatively short conduction distances in this enteric plexus.
    • These findings provide insights into the functional organization of the enteric nervous system.

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