Lumbar splanchnic nerves provide sympathetic innervation via the inferior mesenteric ganglion. Visceral afferent fibers go to spinal cord following pathway of pelvic splanchnic nerve fibers. Pelvic splanchnic nerves are the primary source for parasympathetic innervation. Most organs receive parasympathetic supply by the vagus nerve and sympathetic supply by splanchnic nerves. Sympathetic innervation is supplied by the thoracic splanchnic nerves. Sympathetic innervation is from the Lumbar splanchnic nerves (L1-L2), parasympathetic innervation is from S2-S4. Sympathetic innervation is supplied by the splanchnic nerves that join the celiac ganglia. Empirically proven effects include splanchnic sympathetic nerve discharge and increased arterial pressure. In contrast, erection is mediated primarily by the parasympathetic nervous system via pelvic splanchnic nerves. All carry sympathetic fibers except for the pelvic splanchnic nerves, which carry parasympathetic fibers. The lateral plate mesoderm splits into parietal (somatic) and visceral (splanchnic) layers. It is characterized by hemodynamic changes in splanchnic, systemic and renal circulation. The pelvic splanchnic nerves, S2-4, work in tandem to innervate the pelvic viscera. The pelvic splanchnic nerves arising at S2-S4 are in the lesser pelvis. Elevated PNMT levels can also be triggered by splanchnic nerve impulses.