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Localization of intraspinal longitudinal systems participating in the spreading of viscerosomatic activity.

In experiments on the cats the relationship was studied of individual columns of the spinal cord to irradiation of the early (propriospinal) and late component of viscerosomatic reflex responses. It was found that the intraspinal systems involved in the descending spread of activity forming the early and the late component of the splanchnic response along the spinal cord were localized mainly in the anterolateral quadrants of the white matter. The descending systems are bilateral and cross at the segmental level. The pathways participating in the spread of the two-component somatomotor discharge evoked by intercostal nerve stimulation are localized in the same area. A bilateral lesion of the dorsal part of the lateral columns of segments C1 to C3 strongly inhibited the late component of the reflex responses. Inhibition was reversible, showing that systems modifying the development and course of the late component are localized in this region. Lesion-induced changes in viscerosomatic reflex responses were parallel with changes in somatomotor discharges. This finding supports the opinion that the pathways involved are localized close together and that their action is modified by similar factors.