Meninges of the Brain

• Protective layer covering Central nervous system.

• Three layers;1. Dura Mata2. Arachnoid Mata3. Pia Mata

• Meningitis derived from Meninges

Dura Mater

• Latin for ‘Tough Mother’

• Thick and Durable membrane

• Closest to the Skull

• Composed of Dense Connective tissue

• Supports Venous Channels between

the two membranes

Arachnoid Mater

• Middle part of the Meninges

• Web like appearence

• Provides cushioning effect for the CNS

• Thin transparent membrane

• Impermeable to fluids

Pia Mater

• Latin for ‘Soft Mother’

• Adheres to surface of Brain

• Thin membrane and Impermeable to fluids

• Large Blood Supply

Spaces

• Subarachnoid space contains Cerebrospinal fluid and is between arachnoid and the pia mater

• Active in the blood brain barrier

• Through injury dura mater and arachnoid mater

separate and form the subdural space.