Abstract
Electrical responses to somatic afferent stimulation were studied with the aim of determining their distribution with respect to morphological groupings of the cat diencephalon in two hundred twelve histologically analyzed explorations. In addition to the well-known tactile projection to the ventrobasal (VB) complex, nontactile somatic responses of longer latency were found with reasonable consistency in the centrum medianum-parafascicular (CM) complex, posterior complex, central commissural system, ventrolateral complex, and nucleus ruber, as well as in several subthalamic structures for which the findings were some-what less secure. Some evidence is presented suggesting that the CM response may be excited by the spinothalamic system and that responses in this region differ from those in the classical lemniscal pathway (VB) in modality and somatotopic representation, latency, spinal pathway, and anesthetic susceptibility.
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