Bai Z Q, Chen Z H, Chen P X
Department of physiology, Sun Yat-Sen University of Medical Science, Guangzhou.
Sheng Li Xue Bao. 1993 Aug;45(4):348-53.
When the projecting point of saphenous nerve in second somatosensory cortex (S II) of cat was stimulated, the evoked potentials elicited by C-fiber inputs of saphenous nerve recorded in the primary somatosensory cortex (C-CEP) might be either inhibited or facilited according to whether the superficial and/or the deeper layer of the cortex was stimulated. The inhibition was expressed as a decrease of amplitude and prolongation of latency of C-CEP; while the facilitation, as an increase of amplitude and duration of C-CEP. When the superfaicial layer of S II was stimulated by weaker current, both inhibitory and facilitatory effects could be observed, but only inhibitory effect was observed, when the deep layer was stimulated. With the same intensity of stimulation, inhibitory effect was more pronounced when the deep layer rather than the superficial layer was stimulated. It is suggested that S II may play a role in the modulation of C-CEP of S I.
刺激猫第二体感皮层（SⅡ）中隐神经的投射点时，根据皮层浅层和/或深层是否受到刺激，在初级体感皮层记录到的隐神经C纤维输入所诱发的诱发电位（C-CEP）可能会受到抑制或易化。抑制表现为C-CEP的波幅降低和潜伏期延长；而易化则表现为C-CEP的波幅增加和时程延长。当用较弱电流刺激SⅡ浅层时，抑制和易化效应均可观察到，但刺激深层时仅观察到抑制效应。在相同刺激强度下，刺激深层时的抑制效应比刺激浅层时更明显。这表明SⅡ可能在对SⅠ的C-CEP的调制中发挥作用。
