Advanced Pia Mater Quiz

Q1. Why are denticulate ligaments considered specializations of pia rather than arachnoid?

• They originate from vertebral periosteum
• They originate from the pial surface of the spinal cord
• They are folds of arachnoid with no pial attachment
• They arise from epidural fat

Q2. How do denticulate ligaments divide the subarachnoid region around the spinal cord?

• They separate dura from vertebral periosteum
• They separate right and left halves of the spinal cord
• They lie between the anterior and posterior spinal nerve roots
• They divide gray matter from white matter

Q3. What anatomical feature allows pia to support vessels entering the spinal cord?

• Its close adherence lets it accompany penetrating vessels from the cord surface
• It prevents vessels from entering neural tissue
• It lies entirely outside the dural sac
• It forms a rigid bony canal around arteries

Q4. Why is the filum terminale internum found within the lumbar cistern?

• The arachnoid ends at the conus medullaris
• The filum lies in the epidural space
• The pial continuation descends below the conus within the CSF-filled meningeal sac
• The entire spinal cord continues to S2

Q5. How does the filum terminale externum differ from the filum terminale internum?

• The external part contains the spinal cord
• The external part has a dural covering, while the internal part lies within the dural sac as a pial strand
• There is no anatomical distinction
• The internal part is a spinal nerve and the external part is an artery

Q6. Why can pia be difficult to remove cleanly from the spinal cord?

• It is intimately adherent to neural tissue and follows surface irregularities
• It is filled with epidural fat
• It is fused to vertebral periosteum
• It is thicker than spinal dura

Q7. What is the relationship between pia and the subarachnoid CSF compartment?

• Pia and arachnoid are normally fused
• CSF lies deep to pia within spinal cord white matter
• Pia forms the inner boundary of the CSF-filled subarachnoid space
• Pia forms the outer boundary of the epidural space

Q8. How do pia-derived denticulate ligaments stabilize the cord without rigidly fixing it?

• Intermittent lateral attachments limit displacement while permitting some movement
• They immobilize every spinal nerve root
• They eliminate the subarachnoid space
• They fuse the entire cord to vertebral bone

Q9. Which feature most clearly distinguishes pia from spinal dura in relation to the cord?

• Pia directly invests the cord, while dura forms an outer meningeal sac
• Both directly adhere to the spinal cord surface
• Pia forms the epidural space
• Dura enters every spinal cord sulcus while pia does not

Q10. Which statement best integrates spinal pia mater anatomy?

• It bridges over the cord surface and forms the outer boundary of the subarachnoid space
• It is the tough outer meningeal sac ending at S2
• It closely invests the spinal cord and forms denticulate ligaments and the filum terminale
• It lies outside dura and contains epidural fat