Facilitation of reflex swallowing from the pharynx and larynx
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概要
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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)
- 日本大学歯学部の論文
著者
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Nakagawa Kazuharu
Department Of Hygiene And Oral Health Showa University School Of Dentistry
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Iwata Koichi
Department Of Chemistry And Research Centre For Spectrochemistry School Of Science The University Of
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Yamada Yoshiaki
Division Of Dysphagia Rehabilitation Niigata University Graduate School Of Medical And Dental Scienc
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Kitagawa Junichi
Department of Internal Medicine, Kisogawa Municipal Hospital
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Hasegawa Momoko
Department of Orthodontics, Nihon University School of Dentistry
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Iwakami Tomoyo
Department of Dysphagia Rehabilitation, Nihon University School of Dentistry
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Shingai Tomio
Division of Oral Physiology, Department of Oral Biological Science, Niigata University Graduate School of Medical and Dental Sciences
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YAMADA Yoshiaki
Division of Oral Physiology, Department of Oral Biological Science, Niigata University Graduate School of Medical and Dental Sciences
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- Foreword