Meninges

Question 1

Describe Meninges

Answer 1

-dura matter
-outermost layer, tough
-double sided, external covering

Question 2

What is the periosteum?

Answer 2

-attached to the inner surface of the skull

Question 3

What is the meningenal layer?

Answer 3

Outermost covering of the brain and folds inward in many areas

Question 4

What is the arachnoid layer?

Answer 4

-middle layer
-web-like extensions span the subarachnoid space
-arachnoid villi will reabsorb cerebrospinal fluid

Question 5

Describe Pia mater

Answer 5

-internal layer
-clings to surface

Question 6

Describe cerebrospinal fluid

Answer 6

-similar to blood plasma which is a watery substance to form a watery cushion
-formed by the choroid plexus which are capillaries in the ventricles of the brain
-found in arachnoid space, ventricles, and central canal of the spinal cord

Question 7

Describe the blood-brain barrier

Answer 7

-prevents many potential harmful substances
-includes least permeable capillaries
-fat, solvable molecules, respiratory gases, alcohol, nicotine, anesthesia

Question 8

What is hydrocephalus?

Answer 8

-where CSF accumulates and exerts pressure on the brain, in adults this causes brain damage