Meninges the coverings of the brain.

 

Meninges:

• Brain is protected by cranium and meninges.

• Brain has special coverings called “meninges”.

• Meninges covers Brain and spinal cord.

• Three covers:

• Dura Mater (Outermost)

• Arachnoid Mater, (Middle)

• Pia Mater. (Inner)

• Spaces between meninges

• Subdural Space: Between Dura and Arachnoid Mater.

• Subarachnoid Space: Between Arachnoid mater and Pia Mater.

• Outermost Layer is “Dura Mater”

• Lies inside the skull.

• Forms compartments or folds.

• Two imp. Folds of Dura mater:

• Falx: Divides brain laterally.

• Tentorium: Divides brain horizontally.

• Arachnoid Mater covers the entire brain.

• Pia Mater is the innermost layer, containing numerous blood vessels. 

• Cerebrospinal fluid is present in subarachnoid space.

• Main function of meninges is “Protection”.

Commonly Asked Question.

1. Write a short note on the meanings of the brain.