Identification and characterization of cerebral-to-buccal interneurons implicated in the control of motor programs associated with feeding in Aplysia

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Journal of Neuroscience, Vol 11, 3630-3655, Copyright © 1991 by Society for Neuroscience

ARTICLE

Identification and characterization of cerebral-to-buccal interneurons implicated in the control of motor programs associated with feeding in Aplysia

SC Rosen, T Teyke, MW Miller, KR Weiss and I Kupfermann
Center for Neurobiology and Behavior, New York State Psychiatric Institute, New York 10032.
We identified candidate neurons in the cerebral ganglion that regulate feeding responses mediated by the buccal ganglion. Backfilling the cerebral-buccal connectives revealed that each cerebral hemi-ganglion contains approximately 20 neurons that project axons to the buccal ganglion. Three M-cluster neurons (CBI-1, CBI-2, CBI-3) and one E- cluster neuron (CBI-4) were identified as cerebral-to-buccal interneurons (CBIs) based on position, morphology, synaptic connections, and ability to drive buccal motor programs (BMPs). CBI-1 responds to touch of the tentacles, lips, and buccal mass. It receives monosynaptic EPSPs from interganglionic, cerebral-to-buccal mechanoafferent (ICBM) neurons and monosynaptically excites buccal cells, some of which are also excited by the ICBMs. Tonic firing of CBI- 1 usually evokes a single cycle of BMP activity. CBI-1 phase-shifts the rhythmic BMP driven by firing a dopaminergic neuron in the buccal ganglion. CBI-1 itself exhibits dopamine-like histofluorescence following formaldehyde-glutaraldehyde fixation. CBI-2 is excited by food stimuli applied to the lips. Constant-current intracellular stimulation of CBI-2 produces phasic firing of the cell that reliably evokes a rhythmic BMP that incorporates buccal and cerebral motor neurons, putative pattern-generating and pattern-initiating neurons, and neuromodulatory cells (metacerebral cells). CBI-4 also evokes a rhythmic BMP, but the details of its actions and synaptic effects differ from that of CBI-2. CBI-3 does not evoke a BMP, even though it is excited by food stimuli applied to the lips, and it makes monosynaptic connections (both excitatory and inhibitory) to many follower cells of the other CBIs. Firing of CBI-3 phase-delays the BMP driven by CBI-2. Since its activity is incorporated into BMPs and it provides direct inputs to elements of the feeding circuitry, it may play a role in pattern generation. The distinctive features of the CBIs suggest that the consummatory phase of feeding may be controlled by a population of interneurons that subserve different roles.

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