Barriers… (W2)

Question 1

What are the 3 barriers that protect the nervoussystem

Answer 1

① bony structures
② meninges - 3 membranes surrounding and supposing
③ barriers between internal and external chemical environments

Question 2

Describe the dura matter

Answer 2

• Outermost layer
• tough fibrous membrane loosely surrounding the brain
• blood and nerve supply

Question 3

Describe the arachnoid mater

Answer 3

• Soft sac- like membrane
• subarachnoid space contains CSF and CNS arteries and veins (tight junctions)

Question 4

Describe me pia mater

Answer 4

• Follows contours of brain
• adheres to the basement membrane of the brain glial surface lining

Question 5

Define dural reflections

Answer 5

2 large reflections of the dura extending into the cranial cavity at the longitudinal and transverse fissures

Question 6

What are the 2 main dural reflections

Answer 6

① Flax cerebelli
② Tentorium cerebelli

Question 7

What is the flax cerebelli

Answer 7

Extends from the cranial roof between the cerebral hemispheres ( crescent shaped )
- longitudinal fissure
- separates cerebral hemispheres
-Attached to crista galli of emmoid bone

Question 8

What is the tentorium cerebelli

Answer 8

Horizontal shelf of dura between the cerebrum and cerebellum
-separates the occipital and temporal lobes from the cerebellum and brainstem
- ensures me cerebellum and underlying brainstem are protected from pressure caused by heavier upper part of brain

Question 9

What is CSF

Answer 9

Clear colouress liquid that occupies the ventricular system
- mixture of water, proteins at low concentrations

Question 10

Where is CSF produced

Answer 10

Choroid plexus
- extends into the ventricles on the dorsal surfaces

Question 11

What are the 3 cellular components of the vascular core

Answer 11

1. pial cells