The Tritonia swim CPG


The central pattern generator (CPG) is a neuronal circuit that produces

the pattern for rhythmical muscle movement and/or  stereotyped behavior.




Left: Schematic model of the Tritonia swim central pattern generator (CPG).

Right: Location of the CPG neurons in the brain.

Dorsal Swim Interneurons (DSI), C2 neuron, Ventral Swim Interneuron B (VSI-B).


The sensory input triggers firing of Tr1, DRI and then DSI, which in turn initiates the swim motor program.



The swim motor pattern

A brief sensory stimulus produces a series of alternating bursting activities in three neurons.

DSI bursts produces dorsal body flexions whereas VSI bursts ventral body flexions.


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