蛙舌下神経の反射放電と舌の刺激部位との関連について
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概要
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The present study was designed to investigate the difference in reflex discharges of the hypoglossal nerve by changing the stimulating portion of the tongue. Tactile and chemical stimuli were applied to two or three portions of the tongue surface and a single electric shock was applied to two branches of the glossopharyngeal nerve supplying the tip and root of the tongue. Reflex discharges were recorded from two branches of the hypoglossal nerve supplying the intrinsic and hyoglossal muscle. The main findings were summarized as follows. 1. Tactile stimuli of cotton fibers applied to the tip, root and middle of the tongue surface elicited reflex discharges in two branches of the hypoglossal nerve. Reflex discharges were the largest in frequency and amplitude when the tongue was stimulated on the tip, and the smallest discharges were generated by stimulus applied to the root of the tongue. Reflex discharges in the branch to the intrinsic muscle were greater than that in the branch to the hyoglossal muscle when any portion of the tongue surface was stimulated. 2. Chemical stimulus with 0.3M NaCl elicited reflex discharges, but stimulus with Ringer's solution did not elicit an obvious discharge. Reflex discharges generated by chemical stimulus were large in frequency and amplitude and lasted a long time. Reflex discharges generated by the stimulus with 0.3M NaCl applied to the tip of the tongue were greater than that generated by the stimulus to the root of it. 3. A single electric shock to the branch of the glossopharyngeal nerve elicited reflex discharges in the branches of the hypoglossal nerve. The threshold value of reflex discharges generated in the hypoglossal nerve by a single electric shock to the branch to the tip of the tongue was lower than that when applied to the branch to the root of it. In this case, the threshold value of reflex discharges elicited in the branch of the hypoglossal nerve to the intrinsic muscle by an electric stimulus was lower than that to the hyoglossal muscle. 4. Reflex discharges of two branches of the hypoglossal nerve become greater in frequency and amplitude with an increase in the amplitude of the compound action potential of the glossopharyngeal nerve when stimulus was increased.
- 九州歯科学会の論文