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The locations of cell bodies of sympathetic neurons projecting to the stomach, the duodenum, the ileum, the colon, the spleen and the pancreas have been studied using retrograde tracing. Projections arose from both pre- and paravertebral ganglia. In the rat, the prevertebral ganglia are the paired coeliac ganglia lying caudo-lateral to the root of the coeliac artery, paired splanchnic ganglia in the abdominal segments of the greater splanchnic nerves, unpaired superior mesenteric and inter-renal ganglia and the inferior mesenteric ganglia. The projections from the prevertebral sympathetic ganglia to the different parts of the gut were organised somatotopically. The most rostral ganglia (splanchnic, coeliac, and superior mesenteric ganglia) contained neurons innervating all regions of the gastrointestinal tract, the pancreas and the spleen. The inter-renal and inferior mesenteric ganglia, located more caudally, contained neurons innervating the distal part of the gut (distal ileum and colon). The innervation of the spleen and the pancreas came from the closest ganglia (sympathetic chains, splanchnic and coeliac ganglia). This organotopic organisation was not found in the sympathetic chain ganglia; the innervation of all organs came predominantly from the lower part of the thoracic chains. A large proportion of the retrogradely labelled nerve cells in the splanchnic ganglia received nitric oxide synthase immunoreactive innervation probably from the spinal cord. In the other prevertebral ganglia, most of the neurons received nitric oxide synthase immunoreactive innervation and/or bombesin immunoreactive innervation. This leads to the conclusion that, in these ganglia, many neurons receive projections from the gastrointestinal tract in addition to the spinal cord.

Locations and Innervation of Cell Bodies of Sympathetic Neurons Projecting to the Gastrointestinal Tract in the Rat.