Celiac Plexus: Understanding Its Connection to the Vagus Nerve
The celiac plexus (solar plexus) is a sympathetic nerve plexus located at the level of L1, surrounding the celiac trunk and superior mesenteric artery. It contains sympathetic fibers (T5–T12 via splanchnic nerves) and some parasympathetic fibers from the vagus nerve, but it is not a plexus of the vagus nerve itself.
Composition
- Sympathetic (majority): Greater/lesser/least splanchnic nerves → celiac ganglia → plexus. Controls vascular tone, inhibits GI motility/secretion.
- Parasympathetic (minority): Vagus nerve (CN X) contributes preganglionic fibers that synapse in enteric ganglia. Stimulates digestion.
Clinical Relevance
Celiac plexus block (neurolysis with alcohol/phenol) treats intractable abdominal pain (pancreatic cancer, chronic pancreatitis) by interrupting sympathetic nociceptive transmission. Vagal fibers are largely spared due to anatomical separation.
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