Deuschl G, Ludolph A, Schenck E, Lücking C H
Neurologische Klinik und Poliklinik, Universität Freiburg, F.R.G.
Electroencephalogr Clin Neurophysiol. 1989 Nov-Dec;74(6):425-30. doi: 10.1016/0168-5597(89)90031-2.
In 15 normal subjects the latency of electrically elicited long-latency reflexes (LLRs) of thenar muscles was compared with somatosensory evoked potentials (SEPs) after median nerve stimulation and with the latencies of thenar muscle potentials after transcranial stimulation (TCS) of the motor cortex. Assuming a transcortical reflex pathway the intracortical relay time for the LLR was calculated to be 10.4 +/- 1.9 msec (mean +/- S.D.) or 8.1 +/- 1.6 msec depending on the experimental conditions. The duration of the cortical relay time is not correlated with the peripheral or central conduction times, with body size or arm length. If the LLRs of hand muscles are conducted transcortically the long duration of the cortical relay time suggests a polysynaptic pathway.
在15名正常受试者中，比较了正中神经刺激后拇短展肌的电诱发长潜伏期反射（LLR）的潜伏期与体感诱发电位（SEP），以及运动皮层经颅刺激（TCS）后拇短展肌电位的潜伏期。假设存在经皮质反射通路，根据实验条件，LLR的皮质内中继时间计算为10.4±1.9毫秒（平均值±标准差）或8.1±1.6毫秒。皮质中继时间的持续时间与外周或中枢传导时间、体型或手臂长度无关。如果手部肌肉的LLR是经皮质传导的，那么皮质中继时间的长时间表明存在多突触通路。
