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Related Experiment Videos

Structural and functional changes in an identified cricket neuron after separation from the soma. I. Structural

R D Clark

    The Journal of Comparative Neurology
    |November 15, 1976
    PubMed
    Summary

    Isolated cricket neuron segments show surprising survival, with arborizations persisting up to 168 days. This suggests an intrinsic capacity for outgrowth independent of the soma, challenging previous understandings of neuronal degeneration.

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    Neuroscience·2008

    Area of Science:

    • Neuroscience
    • Cell Biology
    • Insect Physiology

    Background:

    • Neuronal survival and degeneration are critical processes in neurobiology.
    • Understanding the factors influencing axonal and arborization maintenance is essential for regenerative medicine and neuroscience research.
    • Invertebrate models offer unique advantages for studying cellular mechanisms due to simpler nervous systems.

    Purpose of the Study:

    • To investigate the morphological effects of soma separation on isolated neuronal segments.
    • To determine the survival duration and potential for outgrowth in isolated cricket neuron arborizations and axons.
    • To compare the degeneration patterns of invertebrate axons with vertebrate Wallerian degeneration.

    Main Methods:

    • Surgical separation of the contralateral dorsal longitudinal motor neuron (CDLM) in Teleogryllus oceanicus into soma/proximal arborization and distal axon/arborization segments.

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  • Axonal dye-fills (cobaltous chloride) to determine normal anatomy and track morphological changes.
  • Dissection and histological cross-sections of distal nerve segments to examine axonal degeneration.
  • Observation of morphological changes at successive postoperative time intervals.

    • Main Results:

    • Isolated CDLM arborizations showed variable survival, with one remnant persisting for 168 days, comparable to long-term invertebrate axonal survival.
    • Normally occurring branches of the arborization generally survived for 0–50 days, with progressive loss thereafter.
    • Evidence of supernumerary fibers in isolated arborizations (0–63 days) suggests an independent outgrowth capacity.
    • The distal axonal segment degenerated morphologically and physiologically within 4–15 days, similar to Wallerian degeneration.

    Conclusions:

    • Isolated neuronal arborizations possess a capacity for sustained survival and potential outgrowth independent of the soma.
    • The degeneration of isolated axonal segments closely mimics Wallerian degeneration in vertebrates.
    • These findings contribute to understanding intrinsic neuronal maintenance mechanisms and invertebrate neurobiology.