Related Experiment Videos
Pathways mediating abdominal phasic flexor muscle activity in crayfish with chronically cut nerve cords
Journal of Comparative Physiology. A, Sensory, Neural, and Behavioral Physiology
|January 1, 1995
Summary
Crayfish nerve cord transection initially stops tailflips, but responsiveness returns within weeks. Recovery relies on non-giant pathways within the abdominal nervous system, not axon regeneration.
Area of Science:
- Neuroscience
- Animal Behavior
Background:
- Nerve cord transection in crayfish (Procambarus clarkii) disrupts tailflip responses.
- Understanding the recovery mechanisms and neural pathways is crucial for neuroscience research.
Purpose of the Study:
- To determine the time-course of tailflip recovery after nerve cord transection.
- To analyze the underlying neural pathways involved in the recovery of tailflip ability.
Main Methods:
- Behavioral observations of crayfish.
- Electromyographic recordings of abdominal phasic flexor muscles.
- Intracellular recordings from motoneurons in crayfish with cord lesions.
Main Results:
- Tailflip responsiveness returned in nearly 90% of crayfish within 3 weeks post-lesion.
- Axon regeneration across the lesion played a minimal role in recovery.
- Non-giant pathways within the abdominal nervous system were identified as functional.
Conclusions:
- Recovery of tailflip ability after nerve cord transection is mediated by intrinsic abdominal neural circuits.
- Smaller neural subsets, including single ganglia, can generate tailflip responses.
- Sensory pathways involved in activation project ipsilaterally within the nerve cord.