Nerve
Posterior vagal trunk
Right-predominant vagal pathway behind the abdominal esophagus
High-yield
Vagal parasympathetic distribution extends through the midgut. Pelvic splanchnic pathways become the principal parasympathetic supply of the hindgut.
Overview
The posterior vagal trunk is assembled from esophageal-plexus fibers, predominantly from the right vagus. It gives posterior gastric branches and a celiac contribution, through which vagal pathways reach more distal digestive organs.
Reference facts
- Origin
- Esophageal-plexus fibers with a mainly right-vagus origin.
- Root value
- Cranial nerve X, without a spinal root value.
- Course
- Passes behind the abdominal esophagus through the hiatus and distributes gastric and celiac branches.
- Motor
- Preganglionic parasympathetic fibers influence the posterior stomach and, via abdominal plexuses, small bowel and proximal colon.
- Sensory
- Visceral afferents provide reflex feedback; conscious gastrointestinal pain predominantly reaches the CNS through spinal pathways.
Clinical correlation
Accessory vagal branches to the fundus can preserve gastric secretory stimulation when larger trunks are interrupted. This anatomical variation helps explain incomplete effects of historical acid-reducing vagotomy procedures.
Frequently asked questions
What type of nerve is the posterior vagal trunk?
The posterior vagal trunk is cranial nerve X, without a spinal root value.
What muscles does the posterior vagal trunk supply?
Preganglionic parasympathetic fibers influence the posterior stomach and, via abdominal plexuses, small bowel and proximal colon.
What is the sensory distribution of the posterior vagal trunk?
Visceral afferents provide reflex feedback; conscious gastrointestinal pain predominantly reaches the CNS through spinal pathways.
What is the course of the posterior vagal trunk?
Passes behind the abdominal esophagus through the hiatus and distributes gastric and celiac branches.