This document summarizes key information about the spinal meninges and epidural space. It lists the three meningeal layers - dura mater, arachnoid mater, and pia mater - and describes their structures and functions in protecting the spinal cord. It also explains the epidural space located between the dura mater and vertebral wall, which is the site of anesthetic injection. Finally, it identifies the subdural and subarachnoid spaces filled with cerebrospinal fluid, and notes that a lumbar tap procedure withdraws CSF from the lower lumbar region for diagnosis.

1. NUR IZZATUL NAJWA BINTI SHARUPUDDIN
082015100036

2. ATTHE END OFTHE SEMINAR, STUDENTS
SHOULD BE ABLETO :
 List and expain the spinal meninges
 Know the epidural space and its importance

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

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

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

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

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

8.  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.  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.  Subdural space:
 between arachnoid mater and dura mater
 Subarachnoid space:
 between arachnoid mater and pia mater
 filled with cerebrospinal fluid (CSF)
 LumbarTap withdraws CSF from inferior
lumbar region (below conus medularis) for
diagnostic purposes.

13.  BD CHAURASIA 25TH EDITION
 TEXTBOOK OF HUMAN NEUROANATOMY,
INDERBIR SINGH 7TH EDITION