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Am J Physiol Regul Integr Comp Physiol 282: R818-R827, 2002; doi:10.1152/ajpregu.00180.2001
0363-6119/02 $5.00
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Vol. 282, Issue 3, R818-R827, March 2002

Suppression of vagal motor activities evokes laryngeal afferent-mediated inhibition of gastric motility

Motoi Kobashi1, Tomoshige Koga2, Masatoshi Mizutani3, and Ryuji Matsuo1

1 Department of Oral Physiology, Okayama University Graduate School of Medicine and Dentistry, Okayama 700 - 8525; 2 Department of Restorative Science, Kawasaki University of Medical Welfare, Kurashiki 701 - 0193; and 3 Okayama Prefectural University Junior College, Soja 719 - 1197, Japan

We previously reported that the activation of water-responsive afferents in the superior laryngeal nerve was responsible for the inhibition of gastric motility. The present study was undertaken to clarify the roles of the vagal preganglionic neurons responsible for laryngeal afferent-mediated inhibition of gastric motility. Intravenous injection of atropine abolished the inhibition of motility in both the distal and the proximal stomach induced by water administration into the larynx. The neurons in the dorsal motor nucleus of the vagus (DMV), which project to the abdominal viscera, were exclusively inhibited by water administration. Taken together, inhibition of neurons in the DMV induces inhibition of gastric motility evoked by laryngeal water-responsive afferents via a cholinergic pathway. Because chemical lesions of the intermediate DMV, but not the caudal DMV, abolished the inhibition of the distal stomach motility induced by water administration, the intermediate DMV is responsible for the inhibition shown in the distal stomach.

stomach; relaxation; superior laryngeal nerve; dorsal motor nucleus of the vagus; atropine


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