B7 MOTONEURON

B7 is a neuron located on the dorsal surface of the buccal ganglia. It has a projection down the ipsilateral lateral buccal nerve and it innervates the posterior jugalis muscle in the buccal mass. During feeding cycles B7 is strongly active during the protraction phase due to excitation from the protraction phase CPG interneuron N1M. B7 activity stops during the rasp phase due to N2v inhibition. It is electrically coupled with the N1M and via this electrical connection can alter feeding rhythm generation.

References

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Benjamin, P.R., Crossley, M., 2020. “Gastropod Feeding Systems: Evolution of Neural Circuits that Generate Diverse Behaviors” in Oxford Research Encyclopedia of Neuroscience.

Benjamin, P.R., Rose, R.M., 1979. Central generation of bursting in the feeding system of the snail, Lymnaea stagnalis. J Exp Biol 80, 93–118. https://doi.org/10.1242/jeb.80.1.93

Brierley, M.J., Staras, K., Benjamin, P.R., 1997. Behavioral function of glutamatergic interneurons in the feeding system of Lymnaea: plateauing properties and synaptic connections with motor neurons. J Neurophysiol 78, 3386–3395. https://doi.org/10.1152/jn.1997.78.6.3386

Elliott, C.J.H., Andrew, T., 1991. Temporal Analysis of Snail Feeding Rhythms: A Three-Phase Relaxation Oscillator. Journal of Experimental Biology 157, 391–408. https://doi.org/10.1242/jeb.157.1.391

Staras, K., Kemenes, G., Benjamin, P.R., 1998. Pattern-generating role for motoneurons in a rhythmically active neuronal network. J Neurosci 18, 3669–3688. https://doi.org/10.1523/JNEUROSCI.18-10-03669.1998

Vehovszky A, null, Elliott, C.J., 2001. Activation and reconfiguration of fictive feeding by the octopamine-containing modulatory OC interneurons in the snail Lymnaea. J Neurophysiol 86, 792–808. https://doi.org/10.1152/jn.2001.86.2.792