Meninges of human brain (1-10)

1. Meninges
 Meninges are the membranes Protect the brain and spinal cord.
 Meninges consist of three membranes:
1. Dura mater
2. Arachnoid mater
3. Pia mater
 The meninges of brain and spinal cord are continuous, being linked through the
foramen magnum.
Meninges located between bone and soft tissues of nervous system.
Loation:

2. 1. Dura mater:
• Dura mater is a thick membrane that is the
outermost of the three layers of the meninges that
surround the brain and spinal cord.
• Dura mater is closest to skull.
• Dura mater composed of two:
1. Endosteal layer:
• It is attached to skull.
• It is not continues with dura mater of spinal
cord.
2. Meningeal layer:
• Dura mater proper which cover the brain.
• It is continues with dura mater of spinal cord.
• It is folded inwards as 4 septa between part of
the brain.
• The function of these septa is to restrict the
rotatary displacement of the brain.

3. Dural folds:
 There are 4 dural folds :
1. Falx cerebri
2. Falx cerebelli
3. Tentorium cerebelli
4. Diaphragma sellae
 Dural sinuses also called cerebral
sinuses or cranial sinuses.
 Dural sinuses are venous
channels found between
periosteal and meningeal layers
of dura mater in brain.
Dural sinuses:

4. 2. Arachnoid mater:
 Delicate impermeable and avascular
membrane covering the brain
 Lying between dura mater (externally) and Pia
mater (internally)
 Separated from dura mater by a potential
space, the subdural space (filled by a film of
fluid)
 Separated from pia mater by the subarachnoid
space (filled with CSF)
 All cerebral arteries and veins lie in
subarachnoid space.
 Provide cushioning effect for the CNS

5. 3. Pia mater:
 Pia mater is the innermost, thin, delicate and
highly vascular membran.
 Closely invests the brain, covering the gyri,
descending into the deepest sulci and applied to
the cortical surface.
 Arachnoid villi are the numerous projections to the venous sinus.
 Aggregations of these villi at which CSF diffuses to venus sinuses called
arachnoid granulations.
Arachnoid granulations:

6. Pia mater in spinal
cord:
Pia mater in brain:

7. Brain Meninges:

8. Skin layers: