Homo sapiens thoracic splanchnic nerve greater splanchnic nerve The nerve travels through the diaphragm and enters the abdominal cavity, where its fibers synapse at the celiac ganglia. The nerve contributes to the celiac plexus, a network of nerves located in the vicinity of where the celiac trunk branches from the abdominal aorta. The fibers in this nerve modulate the activity of the enteric nervous system of the foregut. They also provide the sympathetic innervation to the adrenal medulla, stimulating catecholamine release. UBERON:0018680 greater thoracic splanchnic nerve SCTID:280503007 FMA:6281