Figure 1  .

Representation of visceral sensory innervation of the gastrointestinal tract. The sensory innervation that anatomically exists in association with the sympathetic nervous system is shown on the left. These spinal visceral sensory fibres traverse both prevertebral (CG, coeliac ganglion, IMG, inferior mesenteric ganglion, SMG, superior mesenteric ganglion) and paravertebral ganglia en route to the spinal cord. Pelvic and vagus nerve innervation to the sacral spinal cord and brain stem, respectively, is shown on the right. (Modified from Sengupta and Gebhart.¹)