Journal
BRAIN RESEARCH BULLETIN
Volume 122, Issue -, Pages 12-18Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.brainresbull.2016.02.015
Keywords
Swallowing; Insula; Cortical swallowing area; Superior laryngeal nerve; Rat; Cortical masticatory area
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Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan [24390431, 23792507, 26870207]
- Strategic Young Researcher Overseas Visits Program for Accelerating Brain Circulation from the Japan Society for the Promotion of Science [S2504]
- Grants-in-Aid for Scientific Research [26870207, 23792507, 24390431] Funding Source: KAKEN
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We compared onset latency, motor-response patterns, and the effect of electrical stimulation of the cortical masticatory area between peripherally and cortically evoked swallows by electrical stimulation in anesthetized rats. The number of swallows and the motor patterns were determined using electromyographic recordings from the thyrohyoid, digastric, and masseter muscles. The onset latency of the first swallow evoked by electrical stimulation of the cortical swallowing area (Cx) was significantly longer than that evoked by stimulation of the superior laryngeal nerve (SLN). The duration of thyrohyoid burst activity associated with SLN-evoked swallows was significantly longer than that associated with either Cx-evoked or spontaneous swallows. Combining Cx with SLN stimulation increased the number of swallows at low levels of SLN stimulation. Finally, A-area (the orofacial motor cortex) stimulation inhibited Cx-evoked swallows significantly more than it inhibited SLN-evoked swallows. These findings suggest that peripherally and cortically evoked swallows have different response properties and are affected differently by the mastication network. (C) 2016 Elsevier Inc. All rights reserved.
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