Anatomy of blood flow in CNS and consequences of disruption Flashcards
1
Q
How are the venous sinuses formed?
A
Folds in the dura mater, where the meningeal and periosteal layer
2
Q
Recall the drainage of the venous sinsues
A
Drain backwards to confluence of sinuses then into internal jugular vein
3
Q
Define “stroke”
A
Rapidly developing focal disturbance of brain function of presumed vascular origin of >24 hours duration
4
Q
What percentage of strokes are infarcts vs haemorrhagic?
A
85% infarcts, 15% haemorrhagic
5
Q
Define “TIA”
A
Transient Ischaemic Attack:
Rapidly developing focal disturbance of brain function of presumed vascular origin that resolves completely within 24 hours
6
Q
Which ions have a higher concentration in CSF than blood?
A
Mg2+ and Cl-
7
Q
Which ions have a lower concentration in CSF than blood?
A
K+ and Ca2+
