Brain Coverings: Meninges

Question 1

Meninges

Answer 1

3 layers of protective covering called meninges surround the brain and the spinal cord

Question 2

Dura mater

Answer 2

• outermost layer
• thick & tough
• 2 layers: periostea layer (lines inner dome of the skull) & meningeal layer (below that)
• spaces between these layers allow for the passages or veins and arteries that supply blood flow to the brain

Question 3

Arachnoid

Answer 3

• thin, we like layer of connective tissue that does not contain nerves or blood vessels
• below this is the cerebrospinal fluid (CSF) that cushions the entire nervous system (brain & spinal cord) and continuously circulates around these structures to remove impurities

Question 4

Pia mater

Answer 4

• thin membrane that hugs the surface of the brain and follows its contours
• rich in veins and arteries