Circle of Willis
Contents
- 1 Which of the following is not a part of Circle of Willis
- 2 Most commonly involved artery in fenestrations and duplications as physiologic variant in circle of willis is
- 3 Subclavian steal syndrome cause
- 4 Subclavian steal syndrome usually block seen in
- 5 Most common locations for intracranial aneurysms
- 6 Subclavian steal syndrome
Which of the following is not a part of Circle of Willis
[A] Basilar artery
[B] Vertebral artery
[C] Anterior communicating artery
[D] Anterior cerebral arteries
Most commonly involved artery in fenestrations and duplications as physiologic variant in circle of willis is
[A] Basilar artery
[B] Middle cerebral artery
[C] Anterior communicating artery
[D] Anterior cerebral arteries
Subclavian steal syndrome cause
[A] Reduced perfusion to Brain
[B] Increased perfusion to Brain
[C] Reduced perfusion to ipsilateral upper limb
[D] Reduced perfusion to contralateral upper limb
Subclavian steal syndrome usually block seen in
[A] proximal stenosis of subclavian artery
[B] distal stenosis of subclavian artery
[C] proximal stenosis of vertebral artery
[D] distal stenosis of vertebral artery
Most common locations for intracranial aneurysms
[A] Basilar artery[B] Putamen
[C] Anterior communicating artery
[D] Midbrain
Circle of Willis – composed of the following arteries:
- Anterior cerebral artery (left and right) at their A1 segments
- Anterior communicating artery
- Internal carotid artery (left and right) at its distal tip (carotid terminus)
- Posterior cerebral artery (left and right) at their P1 segments
- Posterior communicating artery (left and right)
Subclavian steal syndrome
- In subclavian steal syndrome – blood is “stolen” from the vertebral artery on the affected side to preserve blood flow to the upper limb.
- Subclavian steal syndrome results from a proximal stenosis of the subclavian artery
