Role of the parvicellular reticular formation in facilitating the jaw-opening reflex in rats by stimulation of the red nucleus

Brain Research
Yoshihide SatohToshiki Murakami

Abstract

In a previous study, we have shown that electrical and chemical stimulation of the red nucleus (RN) facilitates the jaw-opening reflex (JOR). The RN sends projection fibers bilaterally, with contralateral dominance, to the part of the parvicellular reticular formation (RFp) containing premotor neurons projecting to the trigeminal motor nucleus. This implies that RN-induced facilitation of the JOR might be mediated via last-order neurons in the RFp. Here, we address this issue by investigating whether microinjection of lidocaine or l-glutamate into the RFp affects RN-induced modulation of the JOR. Experiments were performed on rats anesthetized with urethane-chloralose. The JOR was evoked by electrical stimulation of the inferior alveolar (IA) nerve and was recorded as an electromyographic response from the anterior belly of the digastric muscle. Conditioning stimulation was delivered unilaterally to the RN 12 ms before the IA test stimulation. We found that local injections of 2% lidocaine (0.5 microl) into the RFp, contralateral to the RN, significantly (P < 0.05) reduce RN-induced facilitation of the JOR, whereas corresponding injections of 0.1 mM l-glutamate (0.5 microl) significantly (P < 0.05) increase it. These results su...Continue Reading

References

Sep 1, 1979·Neuroscience Letters·H M Murray, M E Gurule
Dec 10, 1990·Brain Research·C PedroarenaF R Morales
Nov 1, 1983·The Journal of Comparative Neurology·J B Travers, R Norgren
Feb 10, 1983·The Journal of Comparative Neurology·J Y ShiehW C Wong
Jul 2, 2003·Brain Research·Yoshihide SatohToshiki Murakami
Jun 1, 1955·The Journal of Comparative Neurology·E E KINGK R UNNA

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