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Related Experiment Videos

Intrinsic rhythm and basic tonus in insect skeletal muscle.

G Hoyle

    The Journal of Experimental Biology
    |April 1, 1978
    PubMed
    Summary

    Insect jumping muscles exhibit intrinsic rhythm (IR) contractions, influenced by neural activity. This study details how specific neuronal signals modulate muscle contraction frequency, amplitude, and duration.

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    Area of Science:

    • Insect physiology
    • Muscle contraction mechanisms
    • Neurobiology

    Background:

    • The jumping muscle of orthopterous insects possesses intrinsic rhythm (IR) contractions, a fundamental aspect of their locomotion.
    • This muscle also exhibits intrinsic basic tonus (BT), which is modulated by neural input.
    • Understanding the neural control of these muscle activities is crucial for comprehending insect movement.

    Purpose of the Study:

    • To investigate the effects of specific neuronal activity on the intrinsic rhythm (IR) of insect jumping muscles.
    • To elucidate the modulatory roles of the common inhibitor (CI) and slow extensor tibiae (SETi) axons on IR contractions.
    • To determine how neural inputs influence muscle tonus and contraction dynamics.

    Main Methods:

    • Electrophysiological recordings were used to examine the effects of stimulating common inhibitor (CI) and slow extensor tibiae (SETi) axons on muscle activity.
    • Various stimulation frequencies and regimes were applied to assess their impact on intrinsic rhythm (IR) contractions and basic tonus (BT).
    • The study analyzed changes in contraction frequency, amplitude, and duration in response to neural stimulation.

    Main Results:

    • Common inhibitor (CI) axon stimulation above 2 Hz alters IR contractions, causing amplitude depression, reduced duration, and increased frequency; at 30 Hz, it completely suppresses IR.
    • Slow extensor tibiae (SETi) axon stimulation at low frequencies (below 10 Hz) increases IR frequency and decreases amplitude, while higher frequencies (above 15 Hz) lead to SETi-evoked contractions dominating.
    • Single impulses in SETi or FETi axons can initiate IR contractions, alter phasing, and even terminate ongoing IR contractions under specific conditions.
    • The study found that the readiness to initiate an IR contraction is independent of the pacemaker rhythm itself.

    Conclusions:

    • Neural inputs, particularly from CI and SETi axons, play a significant role in modulating the intrinsic rhythm (IR) and basic tonus (BT) of insect jumping muscles.
    • Specific patterns of neuronal activity can initiate, suppress, enhance, or terminate muscle contractions, providing fine-tuned control over insect locomotion.
    • The findings reveal complex interactions between neuronal signaling and muscle physiology, highlighting the sophisticated mechanisms underlying insect movement.

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