Do Splanchnic Nerves Synapse?

The greater splanchnic nerve travels through the diaphragm and enters the abdominal cavity. 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.

Where do the lumbar splanchnic nerves synapse?

The site of synapse is found in the inferior mesenteric ganglion and the postsynaptic fibers innervate the smooth muscle and glands of the pelvic viscera and hindgut.

Where do the splanchnic nerves for the cardiopulmonary plexus synapse?

Regarding the sympathetic innervation in the abdomen, preganglionic splanchnic nerves from the thoracic sympathetic chains descend through the diaphragm to synapse in preaortic (prevertebral) ganglia.