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Morphological changes associated with stretch in a mechano-receptor.

J M Krauhs, M Mirolli

    Journal of Neurocytology
    |April 1, 1975
    PubMed
    Summary

    The S neurons in crustacean coxal receptors maintain a steady response to stimuli. Morphological changes in these neurons under stretch suggest an electrical model similar to vertebrate photoreceptors.

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    Area of Science:

    • Neuroscience
    • Crustacean physiology
    • Sensory receptor biology

    Background:

    • The S neurons in decapod crustacean coxal receptors exhibit a sustained response to constant stimuli.
    • This neuronal property allows for fixation in either stretched or relaxed states, facilitating morphological studies.

    Purpose of the Study:

    • To investigate the morphological effects of mechanical stretch on crustacean S neurons.
    • To explore the ion permeability of the extracellular space surrounding nerve terminals.
    • To evaluate the relevance of an electrical model, analogous to vertebrate photoreceptors, for these neurons.

    Main Methods:

    • Fixation of crustacean coxal receptors in stretched and relaxed states.
    • Perfusion with lanthanum chloride to assess extracellular ion permeability.
    • Microscopic examination of neuronal morphology, focusing on dendritic structures and mitochondria distribution.

    Main Results:

    • The extracellular space around nerve terminals, including tubular endings, is ion-open.
    • Stretched specimens showed approximately 25% smaller cross-sections in tubular processes (dendritic fingers).
    • Secondary dendritic branches appeared shorter and thicker in stretched specimens, with mitochondria located peripherally but not in the fingers.

    Conclusions:

    • The observed morphological changes in S neurons under stretch are consistent with an electrical model similar to vertebrate photoreceptors.
    • Mitochondrial distribution suggests a functional role in neuronal signaling and adaptation to mechanical stimuli.

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