- 期刊
EFFECT OF LINGUAL NERVE AND ITS RELATED NUCLEUS ACTIVITY ON THE JAW-CLOSING REFLEX MECHANISM
舌神經及三叉神經脊髓核對閉口反射機構之作用
摘要
The effects of ipsilateral lingual nerve and trigeminal spinal nucleus stimulation on the masseteric monosynaptic reflex were studied. The stimulation mesencephalic nucleus in ipsilateral masseteric nerve evoked two pear is of potential having a latency of 0.74 and 1.59 msec, respectively. The latter is the monosynaptic reflex potential which was suppressed by repeated mesencephalic stimulation at 2-5/sec, and the former is the antidromic potential which was not altered even in the situation of the stimulation frequency up to 100/sec. The post-and presynaptic inhibition appeared when the low threshold stimulus was applied to the lingual nerve, however, the postsynaptic inhibition was revealed at the stimulation of trigeminal spinal nucleus. Intravenous injection of strychnine caused the disappearrence of postsynaptic inhibition.
關鍵字
無資料並列摘要
高等動物在咀嚼運動時，舌及顎二者之間，需有極密切的協同作用才能圓滿達成。今以猫的舌神經及三叉神經脊髓核為對象，研究其興奮時對閉口反射的作用。刺激三叉神經中腦核，在咬肌神經可紀錄到雙峯的動作電位，其潛伏期（latency）分別為0.74及1.59 msec.第二峯電位為通過單突觸的咬肌神經反射（masseteric monosynaptic reflex），此反射可被2-5次／秒的反複刺激所抑制。而第一峯電位為逆行性電位（antidromic potential），此電位並不因刺激頻率增加到100次／秒而有所改變。給于舌神經低閾（low threshold）的刺激對咬肌神經反射產生突觸前（presynaptic）及突觸後（postsynaptic）抑制作用。而三叉神經脊髓核的興奮對咬肌神經反射只產生突觸後抑制作用。靜脈注射番木鼇素（strychnine）後，突觸後抑制作用消失。