Advanced Meninges Quiz

Q1. Which sequence correctly lists major spinal spaces and layers from the vertebral canal toward the spinal cord?

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

Q2. Why can lumbar puncture at L3-L4 or L4-L5 enter the subarachnoid space even though the spinal cord usually ends higher?

• The dura ends at L1
• The subarachnoid space lies outside the dura
• The spinal cord itself extends to S2
• The meningeal sac continues below the conus to about S2

Q3. What is the anatomical relationship of denticulate ligaments to the spinal nerve roots?

• They surround dorsal root ganglia as dural sleeves
• They extend between anterior and posterior spinal nerve roots
• They lie only anterior to all nerve roots
• They form the cauda equina

Q4. What happens to the filum terminale near the inferior end of the dural sac?

• It becomes a spinal nerve
• It terminates at the conus
• It becomes the ligamentum flavum
• It acquires a dural covering and continues as the filum terminale externum

Q5. Why are the internal vertebral venous plexuses clinically important?

• Their valveless communications permit bidirectional venous flow
• They produce CSF
• They form denticulate ligaments
• They are isolated from systemic veins

Q6. Which meningeal layer forms the inner boundary of the spinal subarachnoid space?

• Pia mater
• Ligamentum flavum
• Dura mater
• Vertebral periosteum

Q7. Why are cauda equina roots less vulnerable than the spinal cord to a carefully performed lumbar puncture?

• They lie outside the dural sac
• They are protected inside vertebral bodies
• They are relatively mobile within the CSF-filled lumbar cistern
• They contain no neural tissue

Q8. What anatomical feature distinguishes pia from arachnoid on the spinal cord surface?

• Pia lies outside dura
• Both layers are fused to vertebral periosteum
• Arachnoid directly adheres to neural tissue
• Pia follows cord contours closely, while arachnoid bridges over them

Q9. What is the key compartment difference between epidural and intrathecal procedures?

• Both enter the same CSF compartment
• Intrathecal access remains outside dura
• Epidural access is outside dura, while intrathecal access enters the subarachnoid space
• Epidural access enters pia

Q10. Which statement best integrates the spinal meninges?

• Only dura extends below the conus and CSF lies in the epidural space
• Dura, arachnoid, and pia form layered protection around the cord with distinct epidural, subdural, and subarachnoid relationships
• Pia is the outer layer and dura directly covers the spinal cord
• The three meninges are fused together and contain no spaces