3.2 Brain Protection and Support

Question 1

Major Bones of The Cranium

Answer 1

Frontal Bone

Parietal Bones

Temporal Bones

Occipital Bone

Sphenoid Bone

Question 2

Meningeal Layers

Answer 2

Dura Matter: tough, fibrous layer
(Subarachnoid space)
Arachnoid Matter: delicate membrane
Pia Matter: soft, attached to brain surface

Question 3

CSF

Answer 3

Produced by the choroid plexus, in the third ventricle
Surround all exposed surfaces of CNS, circulate through ventricles, central canal and subarachnoid space

-support brain and spinal cord
-transport nutrients, messengers and waste

Question 4

Blood Brain Barrier

Answer 4

Network of tight junctions between capillary endothelial cells in the CNS
-Isolates CNS from general circulation
-Allows chemical composition of blood and SF to differ
Astrocytes regulate BBB by releasing chemicals that control permeability of endotheilium.