thoracic splanchnic nerve lesser splanchnic nerve UBERON:0018681 lesser thoracic splanchnic nerve The nerve travels inferiorly, lateral to the greater splanchnic nerve. Its fibers synapse with their postganglionic counterparts in the superior mesenteric ganglia, or in the aorticorenal ganglion. The nerve modulates the activity of the enteric nervous system of the midgut. FMA:6282 SCTID:280505000