Protection of the CNS

Question 1

Meninges Components

Answer 1

Dura Mater, Subdural Space, Arachnoid Mater, Subarachnoid Space, Pia Mater

Both Brain + Spinal Cord

Question 2

Dura Mater - Meninges

Answer 2

2 Layers
- Periosteal layer (closer to skull)
- Meningeal Layer (closer to brain)

Tough, Outermost Layer

Question 3

Subdural Space - Meninges

Answer 3

A tiny space filled with blood vessels

Between Dura Mater and Arachnoid Mater

• Location of a subdural haemorrhage

Question 4

Arachnoid Mater - Meninges

Answer 4

Delicate web-like membrane
- Allows CSF to drain

Question 5

Subarachnoid Space - Meninges

Answer 5

Filled with CSF, acting as a cushioning device for brain + spinal cord

Question 6

Pia Mater - Meninges

Answer 6

A thin film that clings to the brain

Is avascular, and supplies some blood flow to the brain

Helps Maintain Shape

Question 7

Cerebrospinal Fluid (CSF)

Purpose + Functions

Answer 7

A clear fluid surrounding the Brain + Spinal Cord

Buoyancy
- Reduces brain weight, and
therefore the potential crushing
of inferior brain tissue

Shock Absorption

Nourishment + Waste Removal

Question 8

Blood/Brain Barrier

Answer 8

Formed by Glial Cells
- Astrocytes
- Encourages endothelial cells to
form junctions

Selectively Permeable
Provides Stable Environment

Question 9

Blood Supply

Answer 9

Circle of Willis

Provides and alternate way to receive blood to the brain, should there be a blockage or injury of some description