Intermediate Vagus Nerve (CN X) Quiz

Q1. Which vagal trunk commonly gives rise to prominent anterior gastric branches?

• Posterior vagal trunk
• Greater thoracic splanchnic nerve
• Left phrenic nerve
• Anterior vagal trunk

Q2. Which vagal trunk commonly gives rise to a celiac branch that joins the celiac plexus?

• Right phrenic nerve
• Posterior vagal trunk
• Anterior vagal trunk only
• Lumbar sympathetic trunk

Q3. A hepatic branch commonly arises from which abdominal vagal trunk?

• Sacral sympathetic trunk
• Greater splanchnic nerve
• Posterior vagal trunk only
• Anterior vagal trunk

Q4. Do vagal parasympathetic fibers normally synapse in the celiac ganglia?

• No, they pass through without synapsing there
• No, because vagal fibers never enter the celiac plexus
• Yes, but only fibers to the stomach
• Yes, all vagal fibers synapse there

Q5. Which portion of the transverse colon generally remains within vagal parasympathetic territory?

• None of the transverse colon
• Only the splenic flexure
• Proximal two thirds
• Distal one third only

Q6. What is the approximate transition landmark between vagal and pelvic splanchnic parasympathetic supply to the colon?

• Pylorus
• Esophageal hiatus
• Left colic flexure
• Ileocecal junction

Q7. How do vagal fibers commonly reach abdominal viscera beyond the stomach?

• Only through the sympathetic trunk
• Through the femoral sheath
• Through autonomic and periarterial plexuses
• Through the lumbar somatic plexus

Q8. Which intrinsic neural system is strongly modulated by vagal parasympathetic input?

• Brachial plexus
• Cervical plexus
• Enteric nervous system
• Sacral somatic plexus

Q9. Which general gastrointestinal response is promoted by vagal parasympathetic activity?

• Suppression of digestive secretion
• Generalized inhibition of peristalsis
• Voluntary contraction of abdominal wall muscles
• Increased gastrointestinal motility and secretion

Q10. Why are postganglionic parasympathetic fibers in vagal pathways relatively short?

• The ganglia lie beside the spinal cord
• The ganglia lie near or within the target organs
• All vagal fibers are postganglionic
• The vagus synapses only in the sympathetic trunk