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Mauthner axon diameter and impulse conduction velocity decrease with growth of goldfish

P G Funch, S L Kinsman, D S Faber

    Neuroscience Letters
    |December 11, 1981
    PubMed
    Summary
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    Goldfish Mauthner axon conduction velocity slows as fish grow longer. Axon diameter also changes with body length, peaking in medium-sized fish, a novel finding in cell function during growth.

    Area of Science:

    • Neuroscience
    • Comparative Physiology
    • Cell Biology

    Background:

    • The Mauthner cell system in fish is crucial for rapid escape responses.
    • Axonal properties, like diameter, influence nerve impulse conduction velocity.
    • Understanding how cellular structures change during organismal growth is vital for developmental biology.

    Purpose of the Study:

    • To investigate the relationship between goldfish body length and Mauthner axon conduction velocity.
    • To determine if changes in Mauthner axon diameter correlate with observed conduction velocity changes.
    • To explore the implications of altered axonal size and conduction velocity during growth.

    Main Methods:

    • Measuring antidromically evoked impulse conduction velocities along the Mauthner axon in goldfish of varying body lengths.

    Related Experiment Videos

  • Quantifying Mauthner axon diameters using microscopy.
  • Analyzing the correlation between body length, axon diameter, and conduction velocity.

    • Main Results:

    • A significant inverse correlation was found between Mauthner axon conduction velocity and goldfish body length.
    • Mauthner axon diameter exhibited a parabolic relationship with body length, with maximal diameter observed in fish measuring 9.5 cm.
    • Conduction velocity and axonal size decreased with increasing fish size after reaching a peak.

    Conclusions:

    • The study demonstrates a decrease in both Mauthner axon conduction velocity and axonal size during goldfish growth.
    • This finding represents the first report of such a decrease while cellular function is maintained.
    • Axonal scaling and conduction velocity adjustments are key features of Mauthner neuron development in goldfish.