The term sympathetic preganglionic pools refers to one of two sets of clusters of neurons in the spinal central gray grouped on the basis of function into preganglionic autonomic pools of the subcortical motor system. They include the the thoracolumbar autonomic nuclei, the intermediomedial cell column, the dorsal gray commissure, and the intercalated nucleus of the spinal cord. The other set consists of the parasympathetic preganglionic pools ( Swanson-2004 ).