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Titolo:
Medullary reticular formation activity during ingestion and rejection in the awake rat
Autore:
Travers, JB; DiNardo, LA; Karimnamazi, H;
Indirizzi:
Ohio State Univ, Coll Dent, Columbus, OH 43210 USA Ohio State Univ Columbus OH USA 43210 , Coll Dent, Columbus, OH 43210 USA
Titolo Testata:
EXPERIMENTAL BRAIN RESEARCH
fascicolo: 1, volume: 130, anno: 2000,
pagine: 78 - 92
SICI:
0014-4819(200001)130:1<78:MRFADI>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
HYPOGLOSSAL PREMOTOR NEURONS; TASTE REACTIVITY TEST; MOTOR NUCLEI; BRAIN-STEM; SOLITARY TRACT; PARABRACHIAL NUCLEUS; FICTIVE MASTICATION; MIMETIC RESPONSES; GUSTATORY STIMULI; NEURAL ACTIVITY;
Keywords:
taste; ororhythmic activity; feeding; brainstem;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
57
Recensione:
Indirizzi per estratti:
Indirizzo: Travers, JB Ohio State Univ, Coll Dent, 305 W 12th Ave, Columbus, OH 43210USA Ohio State Univ 305 W 12th Ave Columbus OH USA 43210 43210 USA
Citazione:
J.B. Travers et al., "Medullary reticular formation activity during ingestion and rejection in the awake rat", EXP BRAIN R, 130(1), 2000, pp. 78-92

Abstract

The consummatory components of ingestion and rejection, organized in the caudal brainstem, include licking, swallowing, and the oral phase of rejection (gaping). Studies employing electrical-stimulation induced motor activity have localized interneurons controlling these complex motor patterns to the medullary reticular formation (RF), but the characteristics of these neurons during more naturally induced behavior are unknown. The purpose of thepresent study was to record the activity profiles of RF neurons during licking, swallowing, and oral rejection in response to gustatory stimulation. Two-hundred and two neurons recorded from awake, freely moving rats were broadly classified as orally related (67%) or non-orally related (33%). Orally related neurons included a large number that were rhythmically active during licking (n=76; 38%). These "lick-rhythmic" neurons were widely distributed in the RF, but were concentrated in the caudal medullary reticular formation adjacent to the hypoglossal nucleus (Probst's region) and further rostral in the intermediate zone (IRt) of the RF. An analysis of autocorrelations determined that lick-rhythmic neurons in these regions were mon closelycoupled to licking than to lick-rhythmic neurons more lateral in the parvocellular RF (PCRt). In addition to neurons with weak lick-rhythmic activity, the PCRt also contained a disproportionate number of neurons with orosensory or mixed oro-sensorimotor properties. These data provide evidence for functional specialization within different regions of the medullary RE A high proportion of lick-rhythmic neurons also showed differential activity associated with swallowing (41%) and/or gaping (75%), further suggesting that the different components of ingestion and rejection share brainstem substrates instead of being produced by unique subsets of interneurons.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/01/20 alle ore 08:56:01