Localization of the central rhythm generator involved in spontaneous consummatory licking in rats: functional ablation and electrical brain stimulation studies
Language English Country United States Media print
Document type Journal Article, Research Support, Non-U.S. Gov't
PubMed
8622936
PubMed Central
PMC39606
DOI
10.1073/pnas.93.8.3325
Knihovny.cz E-resources
- MeSH
- Drinking Behavior drug effects physiology MeSH
- Electric Stimulation MeSH
- Rats MeSH
- Brain anatomy & histology drug effects physiology MeSH
- Periodicity * MeSH
- Consummatory Behavior drug effects physiology MeSH
- Reticular Formation anatomy & histology drug effects physiology MeSH
- Tetrodotoxin administration & dosage toxicity MeSH
- Animals MeSH
- Mastication drug effects physiology MeSH
- Check Tag
- Rats MeSH
- Male MeSH
- Animals MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Names of Substances
- Tetrodotoxin MeSH
Localization of the central rhythm generator (CRG) of spontaneous consummatory licking was studied in freely moving rats by microinjection of tetrodotoxin (TTX) into the pontine reticular formation. Maximum suppression of spontaneous water consumption was elicited by TTX (1 ng) blockade of the oral part of the nucleus reticularis gigantocellularis (NRG), whereas TTX injections into more caudal or rostral locations caused significantly weaker disruption of drinking. To verify the assumption that TTX blocked the proper CRG of licking rather than some relay in its output, spontaneously drinking thirsty rats were intracranially stimulated via electrodes chronically implanted into the oral part of the NRG. Lick-synchronized stimulation (a 100-ms train of 0.1-ms-wide rectangular pulses at 100 Hz and 25-150 microA) applied during continuous licking (after eight regular consecutive licks) caused a phase shift of licks emitted after stimulus delivery. The results suggest that the stimulation has reset the CRG of licking without changing its frequency. The reset-inducing threshold current was lowest during the tongue retraction and highest during the tongue protrusion period of the lick cycle. It is concluded that the CRG of licking is located in the oral part of NRG.
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