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The organization within the descending sympathetic pathways on the surface of the dorsolateral funiculus of the spinal cord was investigated in anesthetized dogs. Changes in heart rate and carotid, renal, and femoral resistances were calculated during electrical stimulation of the descending spinal sympathetic pathways; the location within the pathway of the maximum change in each of these parameters was then determined. Blood pressure increased at each stimulation point with the maximum increase at 3-3.5 mm ventrolateral to the dorsolateral sulcus (DLS). The maximum increases in carotid, renal, and femoral resistances occurred with stimulation at 0.5-1.5, 2, and 3 mm ventrolateral to the DLS, respectively. Maximum heart rate responses were elicited by stimulation 2 mm ventrolateral to the sulcus. These data demonstrate that the pathway is organized in a dorsal-to-ventral manner, with the most rostral parts of the body being represented most dorsally and the more caudal parts being represented more ventrally.

Visceromotor organization within descending spinal sympathetic pathways in the dog.