Intermediate Pelvic Splanchnic Nerves Quiz

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

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

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

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

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

• They ascend within the phrenic nerves
• They ascend through autonomic plexuses toward the inferior mesenteric distribution
• They enter the abdomen through the esophageal hiatus
• 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, all fibers synapse there
• Yes, because it is a parasympathetic ganglion
• 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
• Increased motility and secretory activity
• Permanent contraction of all vascular smooth muscle
• Complete inhibition of peristalsis

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

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

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

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

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

• They are branches of the sacral sympathetic trunk
• They originate in the vagal nuclei
• 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
• Sacral splanchnic nerves
• Vagus nerves
• Pelvic splanchnic nerves

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

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