Cerebral interneurons controlling fictive feeding in Limax maximus - II. Initiation and modulation of fictive feeding
Journal of Comparative Physiology A, ISSN: 0340-7594, Vol: 166, Issue: 3, Page: 311-326
1990
- 41Citations
- 4Captures
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Article Description
Initiation and modulation of fictive feeding by cerebral to buccal interneurons (CBs) was examined in an isolated CNS preparation of Limax maximus. Three CBs which are phasically active during fictive feeding, CB, CB and CB, will reliably trigger bouts of fictive feeding when activated alone or in pairs. Another phasic CB, CB, is not effective for triggering feeding. One CB which is tonically active during fictive feeding, CB, drives fictive feeding in 50% of preparations when activated alone and enhances triggering of feeding when co-activated with phasic CBs. The metacerebral giant cell (MGC) was found to be capable of triggering fictive feeding in preparations with an intact subcerebral commissure. The MGC was especially effective at increasing the effectiveness of other CBs for initiation of feeding. Short high-frequency bursts of phasic CB or MGC action potentials are capable of resetting ongoing fictive feeding. Resetting effects of CB action potentials are relatively independent of the phase of the bite-cycle in which they are activated. CB phase-advances the bite-cycle while the other phasic CBs phase-delay the bite cycle. Moderate frequency stimulation of CB speeds up the bite rate while moderate frequency stimulation of CB slows biting. All CBs, except the tonic CB, CB, increase the intensity of buccal motor neuron bursting during feeding. The excitatory effects of phasic CBs and the tonic CB, CB, on fictive feeding persist for many seconds after the offset of stimulation. CBs form both monosynaptic excitatory and monosynaptic inhibitory connections with different BG motor neurons. © 1990 Springer-Verlag.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0025306427&origin=inward; http://dx.doi.org/10.1007/bf00204805; http://link.springer.com/10.1007/BF00204805; http://link.springer.com/content/pdf/10.1007/BF00204805; http://link.springer.com/content/pdf/10.1007/BF00204805.pdf; http://link.springer.com/article/10.1007/BF00204805/fulltext.html; http://www.springerlink.com/index/pdf/10.1007/BF00204805; http://www.springerlink.com/index/10.1007/BF00204805; https://dx.doi.org/10.1007/bf00204805; https://link.springer.com/article/10.1007/BF00204805
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