Intermediate Vagus Nerve (CN X) Quiz

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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