Sacral splanchnic nerves are sympathetic nerves in pelvis that connect the inferior hypogastric plexus to the sympathetic trunk. They arise from the sacral part of the sympathetic chain, emerging anteriorly from the ganglia. After their origin, they travel to corresponding inferior hypogastric plexus and through this route they innervate pelvic organs and vessels.
Sacral splanchnic nerves are composed of a mixture of preganglionic and postganglionic sympathetic fibers. However, the postganglionic are the dominating type. Some visceral afferent fibers are also present.
Sacral splanchnic nerves should not be confused with pelvic splanchnic nerves, which arise are present in the same region but represent the parasympathetic nervous system.