Epidural space and spinal meninges

Anatomy

1. EPIDURAL SPACE AND SPINAL MENINGES NUR IZZATUL NAJWA BINTI SHARUPUDDIN 082015100036

2. LEARNING OBJECTIVES AT THE END OF THE SEMINAR, STUDENTS SHOULD BE ABLE TO : List and expain the spinal meninges Know the epidural space and its importance

3. INTRODUCTION Upper end – medulla oblongata Lower end – first lumbar vertebra 45cm Conus medullaris (L1) Filum terminale (20cm)

4. SPINAL MENINGES Specialized membranes isolate spinal cord from surroundings Functions : protect spinal cord carry blood supply continuous with cranial meninges

5. Figure 13–3 Spinal Meninges Dura mater : outer layer Arachnoid mater : middle layer Pia mater : inner layer

6. DURA MATER Tough and fibrous membrane Meningeal layer only Contains loose areolar tissue & internal vertebral venous space Extend up 5 to S2

7. ARACHNOID MATER Arachnoid = spiderlike Delicate impermeable membrane Thin membrane Lies between pia and dura mater Extend up to S2

8. PIA MATER Thin and vascular membrane Closely covers spinal cord Continue as filum terminale Undergoes modification : Ligamentum denticulatum 21 pairs teeth like projection Keep spinal cord in position Linea splendens Thickening at anteromedian sulcus

9. The Epidural Space Between spinal dura mater and walls of vertebral canal (above the dura ) No such space in the brain Contains loose connective and adipose tissue Anesthetic injection site

10. Inter Layer Spaces Subdural space : between arachnoid mater and dura mater Subarachnoid space : between arachnoid mater and pia mater filled with cerebrospinal fluid (CSF ) Lumbar Tap withdraws CSF from inferior lumbar region (below conus medularis ) for diagnostic purposes.

11. Lumbar Tap

12. REFERENCES BD CHAURASIA 25 TH EDITION TEXTBOOK OF HUMAN NEUROANATOMY, INDERBIR SINGH 7 TH EDITION