Advanced Greater Splanchnic Nerve Quiz

Q1. Which pathway best describes a typical greater splanchnic sympathetic fiber supplying a foregut organ?

• Thoracic spinal cord to dorsal root ganglion to phrenic nerve
• Spinal cord to sympathetic trunk to greater splanchnic nerve to celiac ganglion to periarterial plexus
• Sacral spinal cord to pelvic splanchnic nerve to celiac ganglion
• Spinal cord to vagus nerve to celiac ganglion to somatic nerve

Q2. Why can sectioning the greater splanchnic nerve affect both autonomic function and visceral pain transmission?

• It carries only cutaneous sensory fibers
• It contains only somatic motor fibers
• It contains only parasympathetic postganglionic fibers
• It contains sympathetic efferents and accompanying visceral afferents

Q3. Why are the celiac ganglia considered prevertebral rather than paravertebral ganglia?

• They lie anterior to the vertebral column near the celiac trunk rather than within the sympathetic trunks
• They are intramural ganglia within the stomach wall
• They are located within dorsal root ganglia
• They lie inside the spinal cord

Q4. How can greater splanchnic visceral afferents contribute to referred pain?

• They transform into cutaneous nerves in the celiac ganglia
• They enter only sacral spinal segments
• They bypass the spinal cord completely
• They converge with somatic afferent input at related thoracic spinal segments

Q5. Why can greater splanchnic sympathetic output influence several different upper abdominal organs?

• All fibers travel through the femoral canal
• The nerve supplies only one fixed organ
• The nerve directly enters every organ without branching
• Postganglionic fibers distribute through interconnected periarterial plexuses

Q6. Which anatomical relationship explains the close functional association between the greater splanchnic nerve and the celiac plexus?

• It provides a major preganglionic sympathetic input to the celiac ganglia and plexus
• It forms the anterior vagal trunk
• It terminates in the inguinal canal
• It becomes the lumbar plexus after crossing the diaphragm

Q7. Why do preganglionic sympathetic fibers in the greater splanchnic nerve remain unsynapsed while traversing the sympathetic trunk?

• The sympathetic trunk contains no neurons
• Their intended synapses are in abdominal prevertebral ganglia
• They must first become parasympathetic fibers
• They are already postganglionic fibers

Q8. Which feature differentiates a typical greater splanchnic pathway from a sympathetic pathway to the body wall?

• Both pathways always synapse in dorsal root ganglia
• Body wall sympathetic fibers travel through the vagus nerve
• Greater splanchnic fibers are somatic motor fibers
• Visceral fibers use prevertebral ganglia, while body wall fibers commonly use paravertebral ganglia

Q9. Why is the segmental origin of the greater splanchnic nerve often described as approximate rather than absolutely fixed?

• The exact thoracic ganglionic contributions show anatomical variation
• It has no relationship to thoracic sympathetic ganglia
• The nerve changes from sympathetic to parasympathetic between individuals
• It originates from cranial nerves in some individuals

Q10. Which statement best integrates the anatomy of the greater splanchnic nerve?

• It is a vagal branch that synapses in intramural ganglia
• It is a thoracic visceral nerve carrying sympathetic preganglionic fibers and visceral afferents toward the celiac prevertebral network
• It is a somatic motor branch of the lumbar plexus
• It is a sacral parasympathetic nerve supplying the hindgut