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Spinal motor patterns in the turtle

P S Stein1, M L McCullough, S N Currie

  • 1Department of Biology, Washington University, St. Louis, Missouri 63130, USA. stein@biodec.wustl.edu

Annals of the New York Academy of Sciences
|February 3, 1999
PubMed
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Hip flexor rhythms can generate scratching patterns without hip extensor activity, challenging the necessity of reciprocal inhibition for motor rhythm generation in turtles.

Area of Science:

  • Neuroscience
  • Motor Control
  • Spinal Cord Circuits

Background:

  • Normal fictive rostral scratching in turtles involves rhythmic alternation between hip flexors and extensors.
  • Spinal cord transections create preparations to study motor pattern generation.
  • Reciprocal inhibition between flexor and extensor neurons is a proposed mechanism for motor rhythmicity.

Purpose of the Study:

  • To investigate the role of reciprocal inhibition in generating rhythmic motor patterns for scratching.
  • To determine if hip flexor rhythm generation is dependent on hip extensor activity.
  • To explore the neural circuitry underlying fictive rostral scratching.

Main Methods:

  • Utilized D3-end turtle preparations with complete spinal transection posterior to the forelimb enlargement.

Related Experiment Videos

  • Applied unilateral and bilateral midbody stimulation to evoke fictive scratching.
  • Analyzed motor output, specifically hip flexor and extensor activity, in response to stimulation.

    • Main Results:

    • Unilateral stimulation in hemisected turtles evoked hip flexor activity without hip extensor activity.
    • Bilateral stimulation reconstructed the normal alternating hip flexor-extensor pattern.
    • Hip flexor rhythms were generated independently of hip extensor activation.

    Conclusions:

    • Reciprocal inhibition between flexor and extensor interneurons is not essential for flexor motor rhythm generation.
    • Hip flexor unit burst generators can be rhythmogenic independently.
    • A shared, bilateral core of hip interneuronal circuitry is crucial for normal fictive rostral scratching.