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VSI-A is a neuron in Tritonia

Basic information

There is one VSI-A in each Cerebral ganglion. It is located near the DSIs. VSI is recognizable by its very small, broad spikes and high level of spontaneous activity.

VSI-A projects its axon contralaterally to the pedal ganglion.

It was initially reported that VSI-A was a component of the Tritonia swim Central Pattern Generator because it fires antiphasically to the DSIs and makes and receives synapses with DSI and C2. However, no effect of VSI-A on the motor pattern has ever been reported.

A second neuron, called VSI-B, on the ventral side of the pleural ganglion seems to be responsible for the ventral phase of the behavior.


  • P. A. Getting, P. R. Lennard, and R. I. Hume. Central pattern generator mediating swimming in Tritonia. I. Identification and synaptic interactions. J.Neurophysiol. 44:151-164, 1980.
  • P. A. Getting. Mechanisms of pattern generation underlying swimming in Tritonia. I. Neuronal network formed by monosynaptic connections. J.Neurophysiol. 46:65-79, 1981.
  • P. S. Katz. Tritonia swim network. Scholarpedia 4 (5):3638, 2009. [1]

See also VSI