Circulus Arteriosus Flashcards
1
Q
Circulus arteriosus
A
Circle of Willis
2
Q
Site
A
- Lies in Interpeduncular cistern at brain base in Interpeduncular fossa neighborhood
- Around hypothalamus region
3
Q
Formation
A
- 6 large arteries
- 3 communicating arteries
4
Q
6 large arteries
A
- Right and left cerebral arteries
- Right and left internal carotid arteries
- Right and left posterior cerebral arteries
5
Q
Size of arteries
A
It is common for them to be very small or even completely absent without any clinical disturbances under normal conditions
6
Q
Anastomoses
A
Cortical branches anastomose with one another before entering brain while central branches are end arteries
7
Q
Clinical importance
A
Under normal conditions, little mingling of blood of both sides occurs but if one big artery becomes closed before it enters in circle formation, the connections may open up
