Hashimoto I, Mashiko T, Mizuta T, Imada T, Iwase Y, Okazaki H, Yoshikawa K
Department of Psychophysiology, Tokyo Institute of Psychiatry, Japan.
Electroencephalogr Clin Neurophysiol. 1995 Apr;97(2):102-13. doi: 10.1016/0924-980x(94)00287-h.
Magnetic compound action fields (CAFs) over the right arm were measured from 63 sensor positions with two 7-channel SQUID gradiometer systems following electrical stimulation of the index and little fingers as well as the ring finger separately. The wave forms of the CAFs were primarily biphasic, corresponding to the depolarization and repolarization currents of the stimulated nerves. Maximum amplitudes of the CAFs were 60-140 fT for the index finger stimulation and 40-90 fT for the little finger stimulation. The field mapping of the CAFs revealed a propagating quadrupolar pattern with different distributions for the index and little fingers. The results agree with the anatomical location of the median and ulnar nerves for the index and little finger stimulation respectively. The isofield maps, due to ring finger stimulation, showed complex patterns as a result of simultaneous activation of the median and ulnar nerves. By comparing the amplitudes of the maxima of the CAFs due to index finger stimulation with those after median nerve stimulation at the wrist, the numerical ratios of the constituent digital nerve fibers for the index finger within the median nerve at the wrist were estimated. The ratios of 0.14-0.41 (mean 0.27), determined with measurement of the CAFs, are fairly consistent with those calculated from the reported histological data.
在分别对食指、小指以及无名指进行电刺激后，使用两个7通道超导量子干涉仪系统从63个传感器位置测量右臂上的磁复合动作场（CAF）。CAF的波形主要为双相，对应于受刺激神经的去极化和复极化电流。食指刺激时CAF的最大振幅为60 - 140 fT，小指刺激时为40 - 90 fT。CAF的场图显示出一种传播的四极模式，食指和小指的分布不同。结果分别与食指和小指刺激时正中神经和尺神经的解剖位置相符。由于无名指刺激产生的等场图显示出复杂的模式，这是正中神经和尺神经同时激活的结果。通过比较食指刺激时CAF最大值的振幅与腕部正中神经刺激后的振幅，估算了腕部正中神经内食指的组成指神经纤维的数值比例。通过CAF测量确定的比例为0.14 - 0.41（平均0.27），与根据报道的组织学数据计算得出的比例相当一致。
