Intermediate Parasympathetic Innervation of the Abdomen Quiz

Q1. Which vagal trunks enter the abdomen through the esophageal hiatus?

• Right and left phrenic nerves
• Anterior and posterior vagal trunks
• Greater and lesser thoracic splanchnic nerves
• Lumbar sympathetic trunks

Q2. The anterior vagal trunk is derived predominantly from which vagus nerve because of embryologic rotation of the stomach?

• Left vagus nerve
• Left phrenic nerve
• Right vagus nerve
• Right sympathetic trunk

Q3. The posterior vagal trunk is derived predominantly from which vagus nerve?

• Right phrenic nerve
• Right vagus nerve
• Left sympathetic trunk
• Left vagus nerve

Q4. How do vagal parasympathetic fibers commonly reach abdominal viscera after entering the abdomen?

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

Q5. Do vagal preganglionic fibers normally synapse in the celiac ganglia?

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

Q6. How do pelvic splanchnic parasympathetic fibers reach the hindgut from the pelvis?

• They travel through the femoral nerve
• They enter through the esophageal hiatus
• They ascend inside the sympathetic trunk and synapse there
• They ascend through autonomic plexuses toward the inferior mesenteric distribution

Q7. Which part of the transverse colon generally receives vagal parasympathetic innervation?

• None of the transverse colon
• Only its serosa
• Distal one-third only
• Proximal two-thirds

Q8. Which part of the transverse colon generally receives pelvic splanchnic parasympathetic innervation?

• Distal one-third
• Only the hepatic flexure
• Proximal two-thirds
• Entire transverse colon from the vagus only

Q9. What is the relationship between parasympathetic fibers and enteric ganglia in the gastrointestinal wall?

• Parasympathetic fibers bypass the gut wall entirely
• All enteric neurons are sympathetic postganglionic neurons
• Preganglionic fibers influence neurons in intramural enteric networks
• Enteric ganglia are located only in the spinal cord

Q10. Which distinction separates pelvic splanchnic nerves from sacral splanchnic nerves?

• Both are parasympathetic nerves from S2 to S4
• Pelvic splanchnic nerves are parasympathetic, while sacral splanchnic nerves are sympathetic
• Sacral splanchnic nerves arise from the vagus nerve
• Both are purely somatic sensory nerves