Localization of descending vasomotor paths in the spinal cord

Responses of the arterial pressure to direct electrical stimulation of spinal tracts at the C5 level were analyzed. Pressor responses with low threshold, high amplitude, and steep rate of rise occurred to stimulation of the dorsolateral zones of the lateral columns. After bilateral destruction of this region the arterial pressure fell to 65. 0±5. 0 mm Hg, responses to stimulation of the pressor zone in the bulbar portion of the vasomotor center disappeared, and responses to stimulation of the peroneal nerve were considerably reduced (to 3. 0± 1.5 mm Hg).