Advanced Thoracic Nerves Quiz

Q1. Which sequence correctly traces a preganglionic sympathetic fiber destined to enter a thoracic splanchnic nerve?

• Posterior horn, posterior root, gray ramus, vagus nerve, thoracic splanchnic nerve
• Anterior horn, phrenic nerve, sympathetic trunk, thoracic splanchnic nerve
• Intermediolateral cell column, anterior root, spinal nerve, white ramus, sympathetic trunk, thoracic splanchnic nerve
• Dorsal root ganglion, vagus nerve, sympathetic trunk, intercostal nerve

Q2. Why do preganglionic fibers in thoracic splanchnic nerves remain preganglionic after traversing the sympathetic trunk?

• They pass through the paravertebral ganglia without synapsing
• They synapse and then become preganglionic again
• They never enter the sympathetic trunk
• They originate in prevertebral ganglia

Q3. Which relationship distinguishes the phrenic nerve from the vagus nerve at the root of the lung?

• The vagus nerve passes anterior and the phrenic nerve passes posterior
• Both nerves pass posterior to the lung root
• Both nerves pass anterior to the lung root
• The phrenic nerve passes anterior to the lung root and the vagus nerve passes posterior to it

Q4. Which nerve is especially vulnerable to pathology involving the aortic arch or ligamentum arteriosum?

• Right recurrent laryngeal nerve
• Left recurrent laryngeal nerve
• Right subcostal nerve
• Intercostobrachial nerve

Q5. Where are the cell bodies of visceral pain afferent fibers that return through thoracic splanchnic nerves located?

• Sympathetic trunk ganglia
• Dorsal root ganglia
• Celiac ganglia
• Anterior horn of the spinal cord

Q6. Which nerves provide somatic sensory innervation to the costal parietal pleura?

• Intercostal nerves
• Vagus nerves
• Thoracic splanchnic nerves
• Recurrent laryngeal nerves

Q7. Which nerves provide somatic sensory innervation to the mediastinal pleura?

• Vagus nerves
• Intercostal nerves
• Phrenic nerves
• Thoracic splanchnic nerves

Q8. Which autonomic nerves form extensive plexuses around the roots of the lungs?

• Phrenic and intercostal fibers only
• Subcostal and lumbar fibers only
• Vagal and sympathetic fibers
• Somatic motor fibers only

Q9. Which statement correctly compares sympathetic fibers in an intercostal nerve with those in a thoracic splanchnic nerve?

• Intercostal nerves carry parasympathetic fibers, while splanchnic nerves carry somatic motor fibers
• Both carry only preganglionic sympathetic fibers
• Intercostal nerves carry mainly postganglionic sympathetic fibers, while thoracic splanchnic nerves carry mainly preganglionic sympathetic fibers
• Both carry only postganglionic sympathetic fibers

Q10. Which description best summarizes the major neural organization of the thorax?

• Only cranial nerves supplying the thoracic wall
• A combination of segmental somatic nerves and sympathetic, parasympathetic, and phrenic pathways
• Only sympathetic nerves arising from thoracic spinal levels
• Only intercostal nerves without autonomic innervation