Emerson R G
Columbia University College of Physicians and Surgeons, New York.
Neurol Clin. 1988 Nov;6(4):735-49.
Following stimulation of the posterior tibial nerve, lumbar electrodes record a response that is the composite of two signals, one (PV) corresponding to the afferent volley in the cauda equina and gracile tract, and another (N22) generated postsynaptically in the gray matter of the lumbar cord. Subcortical structures generate two distinct, widely distributed signals, recordable from scalp electrodes using a noncephalic reference, P31 and N34. P31 is most likely generated by the afferent volley in the caudal medial lemnicus. N34 probably reflects subcortical postsynaptic activity in brain stem and/or thalamus, respectively. The "primary" cortical response, P38/N38, has a complex scalp distribution reflecting the location of the leg area on the mesial aspect of the postcentral gyrus, within the interhemispheric fissure. It is most likely a composite waveform with multiple cortical generators.
刺激胫后神经后，腰部电极记录到的反应是两个信号的复合，一个（PV）对应于马尾和薄束中的传入冲动，另一个（N22）是在腰髓灰质中突触后产生的。皮层下结构产生两个不同的、广泛分布的信号，使用非头部参考电极可从头皮电极记录到，即P31和N34。P31很可能由尾侧内侧丘系中的传入冲动产生。N34可能分别反映脑干和/或丘脑中的皮层下突触后活动。“初级”皮层反应P38/N38在头皮上有复杂的分布，反映了中央后回内侧腿部区域在半球间裂内的位置。它很可能是一个具有多个皮层发生器的复合波形。
