splanchnic nerves splanchnic nerves the splanchnic nerves are paired visceral nerves (nerves that contribute to the innervation of the internal organs), carrying fibers of the autonomic nervous system (visceral efferent fibers) as well as sensory fibers from the organs (visceral afferent fibers). all carry sympathetic fibers except for the pelvic splanchnic nerves, which carry parasympathetic fibers. splanchnic nervesnerves of the autonomic nervous system, with splanchnic nerves seen in center.identifiersmeshd013153anatomical terms of neuroanatomy types the term splanchnic nerves can refer to: cardiopulmonary nerves thoracic splanchnic nerves (greater, lesser, and least) lumbar splanchnic nerves sacral splanchnic nerves pelvic splanchnic nerves comparison nervepre-/postsynapticautonomic systemorigintargets cardiopulmonary nerves postsynapticsympatheticcervical and upper thoracic gangliathoracic cavity thoracic splanchnic nerves generallypresynapticlower thoracic gangliaprevertebral ganglia greater splanchnic nervet5–t9 or t10celiac ganglia lesser splanchnic nervet10–t11superior mesenteric ganglia and aorticorenal ganglia least splanchnic nervet12renal plexus lumbar splanchnic nerves l1–2inferior mesenteric ganglia, ganglia of intermesenteric and hypogastric plexuses sacral splanchnic nerves sacral part of sympathetic trunkinferior hypogastric plexus and ganglia to the pelvic viscera pelvic splanchnic nerves parasympathetics2–s4intrinsic ganglia of descending and sigmoid colon, rectum, and inferior hypogastric plexus and ganglia to the pelvic viscera