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Interactions between segmental leg central pattern generators during fictive rhythms in the locust

S Ryckebusch¹, G Laurent

¹California Institute of Technology, Biology Division, Pasadena 91125.

Journal of Neurophysiology

|December 1, 1994

Summary

Locust leg motor neuron rhythms were reliably evoked in isolated ganglia. Connected ganglia showed less synchronized activity, revealing specific neural coordination patterns crucial for locomotion.

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Area of Science:

Neuroscience
Insect Locomotion
Motor Control

Background:

Rhythmic motor activity is fundamental for locomotion.
Understanding neural control of insect leg movements provides insights into general motor control principles.

Purpose of the Study:

To investigate the rhythmic activity of locust leg motor neurons.
To analyze neural coordination patterns between different leg segments during locomotion.

Main Methods:

Extracellular recordings of leg motor neuron pools.
Cross-correlation analysis of neural activity.
Pharmacological activation using pilocarpine in isolated locust thoracic ganglia.

Main Results:

Rhythmic activity was reliably elicited in isolated ganglia but less synchronized in connected ganglia.

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Specific correlations were found between motor neurons within and between segments, including coactivation and inhibition.

Trochanteral levators showed distinct coupling patterns with contralateral depressors and ipsilateral adjacent hemiganglia.

Conclusions:

Neural coordination for locust locomotion involves complex interactions between motor neurons across segments.
The findings contribute to understanding intersegmental coordination mechanisms in legged locomotion.