Intermediate Pelvic Splanchnic Nerves Quiz

Q1. At approximately what colonic landmark does parasympathetic supply transition from vagal to pelvic splanchnic pathways?

• At the pylorus
• At the ileocecal valve
• At the hepatic portal vein
• Near the left colic flexure

Q2. Which portion of the transverse colon generally receives pelvic splanchnic parasympathetic supply?

• Distal one-third
• Entire transverse colon exclusively
• Proximal two-thirds
• None of the transverse colon

Q3. How can pelvic splanchnic fibers reach abdominal hindgut structures after entering pelvic autonomic plexuses?

• They enter the abdomen through the esophageal hiatus
• They ascend through autonomic plexuses toward the inferior mesenteric distribution
• They ascend within the phrenic nerves
• They travel through the femoral canal

Q4. Do pelvic splanchnic parasympathetic fibers normally synapse in the inferior mesenteric ganglion?

• No, because they never approach the inferior mesenteric plexus
• Yes, because it is a parasympathetic ganglion
• Yes, all fibers synapse there
• No, they generally pass through without synapsing there

Q5. Which functional effect is generally promoted by pelvic splanchnic parasympathetic input to the distal colon?

• Suppression of enteric neuronal activity
• Permanent contraction of all vascular smooth muscle
• Complete inhibition of peristalsis
• Increased motility and secretory activity

Q6. What type of visceral sensory fibers may accompany pelvic splanchnic pathways?

• Branchial motor fibers
• Somatic motor fibers to quadriceps
• Visceral afferent fibers
• Special sensory fibers for vision

Q7. Which intrinsic neural network is modulated by pelvic splanchnic parasympathetic fibers in the distal gut?

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

Q8. Why are pelvic splanchnic nerves described as sacral parasympathetic outflow?

• They originate in the vagal nuclei
• They are branches of the sacral sympathetic trunk
• Their parasympathetic neurons originate from S2 to S4
• They arise from thoracic sympathetic ganglia

Q9. Which nerve type carries sympathetic fibers from the sacral sympathetic trunk and should not be confused with pelvic splanchnic nerves?

• Phrenic nerves
• Vagus nerves
• Pelvic splanchnic nerves
• Sacral splanchnic nerves

Q10. Why are pelvic splanchnic nerves considered autonomic rather than somatic nerves?

• They carry visceral parasympathetic efferent fibers
• They innervate quadriceps directly
• They supply only skin
• They are dorsal rami to intrinsic back muscles