| The superior mesenteric ganglion is located along the abdominal aorta at the root of the superior mesenteric artery. It receives presynaptic sympathetic AND parasympathetic fibers from the celiac ganglia. The sympathetic fibers are some presynaptic fibers from the greater thoracic splanchnic nerves, and they synapse in the superior mesenteric ganglion. The parasympathetic fibers are from the celiac branch of the posterior vagal trunk, and they pass through the ganglion without synapsing. The postsynaptic sympathetic fibers and presynaptic parasympathetic fibers constitute the superior mesenteric plexus, a perivascular plexus extending along the branches of the superior mesenteric artery. |  |
