Facilitation of reflex swallowing from the pharynx and larynx

To evaluate the cooperative effect of afferent signals from the pharynx and larynx on reflex swallowing, the interactive effect of afferent signals from the pharyngeal branch of the glossopharyngeal nerve (GPN-ph) and superior laryngeal nerve (SLN) was analyzed in detail in urethane-anesthetized rat...

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Bibliographic Details
Published in:Journal of Oral Science 2009, Vol.51(2), pp.167-171
Main Authors: Kitagawa, Junichi, Nakagawa, Kazuharu, Hasegawa, Momoko, Iwakami, Tomoyo, Shingai, Tomio, Yamada, Yoshiaki, Iwata, Koichi
Format: Article
Language:English
Subjects:
Animals
deglutition
Deglutition - physiology
Dentistry
Electric Stimulation
Electromyography
glossopharyngeal nerve
Glossopharyngeal Nerve - physiology
Laryngeal Nerves - physiology
Larynx - physiology
Male
Medulla Oblongata - physiology
Neck Muscles - innervation
Neck Muscles - physiology
pharyngeal reflex
Pharynx - innervation
Pharynx - physiology
Rats
Rats, Wistar
Reaction Time
Reflex - physiology
superior laryngeal nerve
swallowing
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Summary:To evaluate the cooperative effect of afferent signals from the pharynx and larynx on reflex swallowing, the interactive effect of afferent signals from the pharyngeal branch of the glossopharyngeal nerve (GPN-ph) and superior laryngeal nerve (SLN) was analyzed in detail in urethane-anesthetized rats. The electromyographic activity of the mylohyoid muscle was recorded as an indicator of swallowing activity. The onset latency of reflex swallowing was measured to evaluate the effects of electrical stimulation of these nerves, and found to become shorter following an increase in the GPN-ph and/or SLN stimulus frequency. During simultaneous electrical stimulation of the GPN-ph and SLN (frequency: 5-10 Hz, intensity: 30 μA, duration: 1.0 ms for each), the onset latency of reflex swallowing became shorter than that for stimulation of each nerve independently. The present findings suggest that spatiotemporal summation of afferent signals from the GPN-ph and SLN results in an increase of motoneuronal activity in the medullary swallowing center, thus enhancing reflex swallowing. (J Oral Sci 51, 167-171, 2009)
ISSN:1343-4934
1880-4926
DOI:10.2334/josnusd.51.167