蛙舌下神経の反射性放電
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概要
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It is main purpose of the present study to investigate the difference of the reflex discharge generated in the branches of the hypogiossal nerve supplying the three lingual muscles by stimuli of the tongue or the glossopharyngeal nerve. The branches of the hypoglossal nerve to the intrinsic, the genioglossal and the hyoglossal muscle were utilized for the present study. The results are summarized as follows : 1. Both branches of the hypoglossal nerve to the intrinsic and the genioglossal muscle generated the spontaneous discharge. However, the branch to the hyoglossal muscle did not generate spontaneously an obvious discharge. Frequency of this discharge generated in the branch to the intrinsic muscle was higher than that of the genioglossal muscle. 2. Chemical stimulation with 0.3M NaCl and tactile stimulation with a horsetail hair applied to the tongue elicited the reflex discharge in the branch to the intrinsic muscle. But, these stimuli did not elicit any reflex discharge in the other branches. Chemical stimulation with NaCl more than 0.6M, with repetitive application of 0.3M NaCl and tactile stimulation with cotton fiber elicited the reflex discharge in all branches of the hypoglossal nerve. In case of these stimuli, discharge frequency of the branch to the intrinsic muscle was higher than those of the other branches. When chemical stimulation with lM NaCl was applied to the tongue, the reflex discharge of the branch to the intrinsic muscle lasted for about 10 min. However, when a maintained stimulus was applied to the tongue, the reflex discharge of the branch to the hyoglossal muscle disappeared rapidly. Water and NaCl less than 0.3M did not elicit any reflex discharge in all branches. 3. The reflex discharges of the three branches elicited by stretch of the tongue were about the smae amplitude. However, it seems that these discharges of the branches to the intrinsic and the genioglossal muscle involved much of the discharge elicited by tactile stimulation, because these branches were most sensitive to tactile stimulation to the tongue. 4. The reflex discharge was elicited in the hypoglossal nerve by a single electric shock to the glossopharyngeal nerve de-efferented. This discharge was divided into two parts by amplitude. The initial part of the discharge passed in a short time was of large amplitude, and the following one was of small amplitude. Amplitude of the initial part of the discharge generated in the branch to the hyoglossal muscle was greater than those of the other branches and disappeared in a short time. In case of the branch to the intrinsic muscle, following part was of high frequency with long duration. 5. Furthermore, the initial part of the reflex discharge was divided into two parts, synchronous discharge with short latency and nonsynchronous discharge with long latency. 6. Repetitive electric shocks to the glossopharyngeal nerve increased frequency and duration of the reflex discharge in the hypoglossal nerve. 7. The total latency of the synchronous reflex discharge was about 2.8 msec.
- 九州歯科学会の論文
- 1974-07-31
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