Advanced Sympathetic Chain Ganglia Quiz

Q1. How does neural crest origin account for the peripheral location of sympathetic chain ganglia?

• The ganglia develop from spinal cord ependyma
• Neural crest cells migrate out of the neural tube before differentiating
• Ganglion cells remain inside the ventricular zone
• Sympathetic ganglia arise from vertebral bone

Q2. What developmental process establishes the longitudinal organization of the sympathetic trunks?

• Segmental paravertebral condensations become interconnected longitudinally
• Dorsal roots fuse into a single cord
• The notochord divides into right and left nerves
• The neural tube splits into paired trunks

Q3. How do sympathetic fibers reach cervical structures despite the absence of cervical white rami communicantes?

• Preganglionic fibers ascend within the trunk from thoracic levels
• Gray rami carry preganglionic fibers into the trunk
• Cervical preganglionic neurons leave through cranial nerves
• Cervical ganglia receive fibers directly from dorsal roots

Q4. How do sympathetic fibers reach the lower limb despite the thoracolumbar origin of preganglionic neurons?

• Lower limb sympathetic neurons arise in sacral parasympathetic nuclei
• Preganglionic fibers descend in the trunk before synapsing at lower levels
• Postganglionic fibers arise from dorsal root ganglia
• White rami occur at every sacral spinal level

Q5. What is a major developmental basis for variation in the number of sympathetic chain ganglia?

• Fusion of sympathetic trunks with vertebral bodies
• Random loss of all postganglionic neurons
• Variable formation of the spinal cord central canal
• Variable fusion of segmental ganglia

Q6. Why is the stellate ganglion an important target for sympathetic blockade?

• It is the only sympathetic ganglion in the body
• It contains or transmits important sympathetic pathways at the cervicothoracic junction
• It lies within the spinal cord
• It contains somatic motor neurons for the upper limb

Q7. How do thoracic splanchnic nerves differ from gray rami communicantes?

• Both terminate in dorsal root ganglia
• Gray rami carry preganglionic fibers while splanchnic nerves carry only sensory fibers
• Both carry only somatic motor fibers
• Splanchnic nerves mainly carry preganglionic fibers while gray rami carry postganglionic fibers

Q8. Why can interruption of the cervical sympathetic trunk cause Horner syndrome?

• It destroys the oculomotor nucleus
• It interrupts sympathetic pathways supplying structures of the head and neck
• It directly damages the optic tract
• It interrupts only vagal parasympathetic fibers

Q9. How are sympathetic chain ganglia and prevertebral ganglia related embryologically?

• Only prevertebral ganglia contain postganglionic neurons
• Paravertebral ganglia derive from mesoderm while prevertebral ganglia derive from endoderm
• Both are neural crest derivatives that occupy different autonomic ganglion locations
• Both develop inside the spinal cord

Q10. Which statement best integrates the development and mature anatomy of sympathetic chain ganglia?

• Neural crest cells form interconnected paravertebral ganglia containing postganglionic sympathetic neurons
• Surface ectoderm forms sympathetic nuclei inside the brainstem
• Mesoderm forms isolated sensory ganglia within vertebral bodies
• Neural tube cells form intramedullary ganglia containing preganglionic neurons