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Related Experiment Videos

[Morphologic changes in synapses following conduction block in a medium of diminished ionic strength]

O S Sotnikov

    Arkhiv Anatomii, Gistologii I Embriologii
    |February 1, 1977
    PubMed
    Summary

    Researchers studied frog sympathetic ganglia to understand conduction blocks. They found synapses in an intermediate phase, suggesting blocks may occur during this transitional state.

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    Bulletin of experimental biology and medicine·2013

    Area of Science:

    • Neuroscience
    • Physiology
    • Cell Biology

    Context:

    • Investigating the precise moment of conduction block in the frog's 10th sympathetic ganglion.
    • Utilizing electrophysiological monitoring of overall synaptic activity for precise timing.

    Purpose:

    • To correlate the morphological changes of the synaptic pericellular apparatus with the functional state of conduction block.
    • To elucidate the synaptic mechanisms underlying the development of conduction block.

    Summary:

    • Supravital staining with methylene blue revealed most synapses in an intermediate phase, characterized by swollen, dye-losing synaptic boutons.
    • Nerve cell bodies appeared unstained against this backdrop, indicating significant morphological alterations during the block.
    • A hypothesis is proposed: conduction block may initiate during the transition from a stained pericellular apparatus phase to this intermediate phase.

    Impact:

    • Provides insights into the dynamic morphological changes of synapses during functional impairment.
    • Contributes to understanding the cellular basis of neural signal transmission failure.
    • Offers a potential new perspective on the sequence of events leading to conduction block in sympathetic ganglia.

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