Far‐field somatosensory evoked potentials in the cat: Correlation with depth recording
Far‐field somatosensory evoked potentials in the cat: Correlation with depth recording
复制标题
猫的远场体感诱发电位：与深度记录的相关性
作者：
MD V. J. Iragui;MD W. C. Wiederholt;Dr Wiederholt
我们之前已经通过表面记录技术确定了四个电位（I， II， III， IV）在猫的体感诱发电位（SEP）的皮质成分之前。在本研究中，我们通过同时记录来自颅骨电极和放置在颈后柱、楔形核、小脑内侧、小脑下脚、后丘脑腹侧和感觉辐射的深度电极的sep，将猫的表面和深度活动联系起来。分析了表面和深度记录电位的潜伏期和振幅及其对重复刺激的反应。我们的研究结果表明：(1)成分I起源于颈后柱和楔状核；(2)成分II反映楔状核、内小丘和小脑下脚的突触后活动；(3)成分III‐A可能起源于小脑半球；(4)成分III‐B由成分III‐A和丘脑腹侧后侧和感觉辐射的叠加活动组成；(5)组分IV源于感觉辐射。
We have previously identified, with surface‐recording techniques, four potentials (I, II, III, IV) preceding the cortical component of the somatosensory evoked potential (SEP) in the cat. In the present study, we correlated surface and depth activity in the cat by recording SEPs simultaneously from skull electrodes and from depth electrodes placed in the cervical posterior columns, cuneate nucleus, medial lemniscus, inferior cerebellar peduncle, ventral posterior thalamus, and sensory radiation. Latencies and amplitudes of surface‐ and depth‐recorded potentials and their responses to repetitive stimulation were analyzed. Our findings indicate that: (1) component I originates in cervical posterior columns and nucleus cuneatus; (2) component II reflects postsynaptic activity in nucleus cuneatus, medial lemniscus, and inferior cerebellar peduncle; (3) component III‐A probably originates in the cerebellar hemispheres; (4) component III‐B consists of component III‐A and superimposed activity in the ventral posterior thalamus and sensory radiation; and (5) component IV originates in the sensory radiation.