Guérit J M, Opsomer R J
Unité d'Explorations Electrophysiologiques du Système Nerveux and Service d'Urologie, Cliniques Universitaires St. Luc, University of Louvain Medical School, Brussels, Belgium.
Electroencephalogr Clin Neurophysiol. 1991 May-Jun;80(3):228-37. doi: 10.1016/0168-5597(91)90125-h.
Somatosensory evoked potentials (SEPs) to unilateral or bilateral posterior tibial nerve (PTN) stimulation and to stimulation of the dorsal nerve (DN) of the penis/clitoris were recorded on 32 channels in 10 volunteers. SEPs to unilateral PTN stimulation consisted of the classic 'W' complex P38-N45-P56-N75 maximal on the ipsilateral central and parietal leads, and two negative waves, N33 and N37, maximal on the contralateral post- and prerolandic areas, respectively. A lemniscal P30 was also recorded. Bilateral PTN stimulation caused, by algebraic summation, the disappearance of both N33 and N37; the W complex was symmetrical and the amplitude of P30 increased. The SEPs to DN stimulation were also symmetrical, and N33 and N37 were absent. These features can be explained by the bilateral character of DN stimulation. They also differed from bilateral PTN SEPs in 3 respects; the absence of P30, the small amplitude and the weaker gradients of field distribution of the 'W' complex, and the somewhat different distribution of penile from clitoral or bilateral PTN, N45 and P56. These differences can be explained both by physiological (the different fiber composition of the DN) and anatomical (the deeper localization of the DN cortical receiving area) mechanisms.
在10名志愿者身上，通过32个通道记录了对单侧或双侧胫后神经（PTN）刺激以及对阴茎/阴蒂背神经（DN）刺激的体感诱发电位（SEP）。单侧PTN刺激的SEP包括经典的“W”复合波P38-N45-P56-N75，在同侧中央和顶叶导联上最大，以及两个负波N33和N37，分别在对侧中央后回和中央前回区域最大。还记录到一个薄束核P30。双侧PTN刺激通过代数求和导致N33和N37均消失；“W”复合波对称，P30的振幅增加。DN刺激的SEP也对称，且没有N33和N37。这些特征可以用DN刺激的双侧性来解释。它们在三个方面也与双侧PTN的SEP不同；没有P30、“W”复合波的振幅小且场分布梯度较弱，以及阴茎SEP与阴蒂或双侧PTN的N45和P56的分布略有不同。这些差异可以通过生理（DN的纤维组成不同）和解剖（DN皮质接收区域的定位更深）机制来解释。
