Advanced Dura Mater Quiz

Q1. Which sequence correctly orders major spinal spaces and meningeal layers from the vertebral canal inward?

• Dura, epidural space, pia, arachnoid, subarachnoid space
• Epidural space, dura, potential subdural space, arachnoid, subarachnoid space, pia
• Arachnoid, dura, epidural space, pia, subdural space
• Pia, subarachnoid space, dura, arachnoid, epidural space

Q2. Why does a lumbar puncture performed at L3-L4 or L4-L5 still encounter the dural sac?

• The dural sac extends well below the conus medullaris to about S2
• The spinal cord normally extends to S2
• The dura ends at T12
• The lumbar puncture is performed outside the vertebral canal

Q3. What is the anatomical basis of the filum terminale externum?

• The posterior longitudinal ligament becomes the filum
• Pia becomes the ligamentum flavum
• A dural covering continues with the filum terminale toward the coccyx
• Arachnoid alone forms a ligament to the sacrum

Q4. Why can the internal vertebral venous plexus provide a route for spread of disease?

• Its valveless communications permit bidirectional venous flow
• It contains arterial valves that force cranial flow
• It drains only into the portal vein
• It is completely isolated from systemic veins

Q5. What is the relationship of the spinal dura to the periosteum at the foramen magnum?

• It enters the subarachnoid space as a free membrane
• It ends several vertebral levels below the skull
• It becomes continuous with cranial dura and attaches around the foramen magnum
• It becomes pia mater

Q6. Why can spinal dural root sleeves be clinically relevant in nerve root pathology?

• The meninges extend laterally around proximal spinal nerve roots
• The root sleeves are made of vertebral bone
• They contain no neural structures
• They occur only around cranial nerves

Q7. How does the true spinal epidural space differ from the cranial epidural space under normal conditions?

• The spinal epidural space lies between arachnoid and pia
• The spinal epidural space is a real compartment, whereas the cranial epidural space is normally potential
• Both are large CSF-filled spaces
• The cranial epidural space contains more fat than the spinal space

Q8. Why does the dural sac protect neural structures while still permitting movement within the lumbar cistern?

• The dura directly fuses every nerve root to vertebral bone
• A strong dural sleeve surrounds a fluid compartment containing mobile nerve roots
• The dural sac contains no fluid
• The cauda equina lies outside the meninges

Q9. What is the anatomical distinction between an epidural and subdural collection in the spinal canal?

• Both lie within the spinal cord
• Subdural collections lie outside vertebral periosteum
• Epidural collections are external to dura, while subdural collections lie between dura and arachnoid
• Both lie between arachnoid and pia

Q10. Which statement best integrates spinal dura mater anatomy?

• It lies between arachnoid and pia and contains CSF
• It directly covers the spinal cord surface and forms denticulate ligaments
• It forms the durable outer spinal meningeal sac, surrounds the CSF compartment, extends to about S2, and continues around proximal nerve roots
• It ends with the spinal cord near L1-L2 and has no nerve root extensions