lecture 9

Question 1

what are the major sinuses between the dural layers?

Answer 1

straight sinus
transverse sinus
petrosal sinus
inferior sagittal sinus
superior sagittal sinus

Question 2

describe the flow of the CSF

Answer 2

lateral ventricle–>3rd ventricle–>4th ventricle –> subarachnoid space–>arachnoid granulations–>venous sinuses

Question 3

describe non-comm hydrocephalus

Answer 3

flow of CSF in ventricular system obstructed –> increased pressure in ventricles (still making CSF)

Question 4

describe communicating hydrocephalus

Answer 4

can’t absorb CSF –> flows freely in ventricular system though

Question 5

describe the BBB

Answer 5

1. arachnod barrier–>tight junctions, and one-way valve arachnoid granulations
2. blood-CSF barrier –> at level of choroid epi cells; also have tight junctions and are fenestrated (stuff can leave but not get in)
3. the BBB proper–> barrier between brain ECF.tissue and capillaries; tight junctions; astrocutes help maintain tight junctions

Question 6

what are the actual spaces in the brain?

Answer 6

• between the periosteal and meningeal layers
• sagittal fissure, separate the two cerebral hemis
• transverse fissure –> separates occipital lobe and cerebellum
• venous sinuses
• subarachnoid space