Central regulation of the pharyngeal and upper esophageal reflexes during swallowing in the Japanese eel
Journal of Comparative Physiology A-Neuroethology Sensory Neural and Behavioral Physiology 192 巻 2 号
111-122 頁
2010-02 発行
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種類 :
全文
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タイトル ( eng ) |
Central regulation of the pharyngeal and upper esophageal reflexes during swallowing in the Japanese eel
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作成者 |
Ando Masaaki
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収録物名 |
Journal of Comparative Physiology A-Neuroethology Sensory Neural and Behavioral Physiology
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巻 | 192 |
号 | 2 |
開始ページ | 111 |
終了ページ | 122 |
抄録 |
We investigated the regulation of the pharyngeal and upper esophageal reflexes during swallowing in eel. By retrograde tracing from the muscles, the motoneurons of the upper esophageal sphincter (UES) were located caudally within the mid-region of the glossopharyngeal-vagal motor complex (mGVC). In contrast, the motoneurons innervating the pharyngeal wall were localized medially within mGVC. Sensory pharyngeal fibers in the vagal nerve terminated in the caudal region of the viscerosensory column (cVSC). Using the isolated brain, we recorded 51 spontaneously active neurons within mGVC. These neurons could be divided into rhythmically (n = 8) and continuously (n = 43) firing units. The rhythmically firing neurons seemed to be restricted medially, whereas the continuously firing neurons were found caudally within mGVC. The rhythmically firing neurons were activated by the stimulation of the cVSC. In contrast, the stimulation of the cVSC inhibited firing of most, but not all the continuously firing neurons. The inhibitory effect was blocked by prazosin in 17 out of 38 neurons. Yohimbine also blocked the cVSC-induced inhibition in five of prazosin-sensitive neurons. We suggest that the neurons in cVSC inhibit the continuously firing motoneurons to relax the UES and stimulate the rhythmically firing neurons to constrict the pharynx simultaneously.
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著者キーワード |
Swallowing
Esophagus
Medulla oblongata
Vagal nerve
Catecholamines
Japanese eel
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NDC分類 |
動物学 [ 480 ]
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言語 |
英語
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資源タイプ | 学術雑誌論文 |
出版者 |
Springer
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発行日 | 2010-02 |
権利情報 |
Copyright (c) 2010 Springer
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出版タイプ | Author’s Original(十分な品質であるとして、著者から正式な査読に提出される版) |
アクセス権 | オープンアクセス |
収録物識別子 |
The original publication is available at www.springerlink.com
[ISSN] 0340-7594
[DOI] 10.1007/s00359-009-0498-4
[NCID] AA00695961
[DOI] http://dx.doi.org/10.1007/s00359-009-0498-4
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