connects branching part of splanchnic nerve nerve of thoracic segment thoracic sympathetic nerve trunk thoracic splanchnic nerve FMA:6280 Wikipedia:Thoracic_splanchnic_nerves Thoracic splanchnic nerves are splanchnic nerves that arise from the sympathetic trunk in the thorax and travel inferiorly to provide sympathetic innervation to the abdomen. The nerves contain preganglionic sympathetic and general visceral afferent fibers. UBERON:0018679