Amantini A, Bartelli M, de Scisciolo G, Lombardi M, Grippo A, Pinto F
Department of Neurological and Psychiatric Sciences, University of Florence, Italy.
Electromyogr Clin Neurophysiol. 1992 Jan-Feb;32(1-2):73-80.
In each of 10 normal subjects, P28 and N31 far-field components as well as the cortical N37 and P40 waves were identified for both Sural (SN) and Posterior Tibial nerve (PTN) stimulation at the ankle. Peripheral conduction velocity along the popliteal fossa-L3 segment and spinal transmission velocity over the L3-Cv2 segment did not differ significantly for the two nerves. The average latencies of N37 and P40 to stimulation of PTN were 2.55 and 3.65 msec shorter than corresponding latencies from SN. If we consider the P28-N37 and P28-P40 intervals as central transmission times, only the former approaches upper limb CCT values closely enough to support the analogy between median nerve N20 and PTN N37. At the intracranial level, the P28-N37 inter-peak latency was significantly shorter for PTN than SN. The P28 component is generally attributed to lemniscal activity. Thus, the discrepancy in afferent transmission times from the leg's mixed and sensory nerves would appear to take place at a level that is supralemniscal but subcortical.
在10名正常受试者中，分别对踝部的腓肠神经（SN）和胫后神经（PTN）进行刺激，识别出P28和N31远场成分以及皮层N37和P40波。两条神经在腘窝-L3节段的外周传导速度以及L3-Cv2节段的脊髓传导速度没有显著差异。刺激PTN时N37和P40的平均潜伏期比刺激SN时相应的潜伏期分别短2.55毫秒和3.65毫秒。如果将P28-N37和P28-P40间隔视为中枢传导时间，只有前者足够接近上肢中枢传导时间值，以支持正中神经N20与PTN N37之间的类比。在颅内水平，PTN的P28-N37峰间潜伏期明显短于SN。P28成分通常归因于薄束活动。因此，来自腿部混合神经和感觉神经的传入传导时间差异似乎发生在薄束以上但皮层下的水平。
