Week 1 - Lesson 5 Flashcards
How many arteries does the brain receive blood from?
4
What are the 4 arteries that the supplies the brain? (2)
- Paired ICA
2. Paired vertebral arteries
What joins the ICA and the vertebral arteries?
The basilar artery
- at the base of the brain
What does the basilar artery form?
The circle of Willis
What does the circle of willis supply?
The cerebral lobes with many smaller branches reaching the periphery
What does the ICA branch to form?
The anterior cerebral
What does the anterior cerebral supply? (3)
- Anterior cerebral artery
- Middle cerebral artery
- Posterior communicating artery
What is formed with the joining of the vertebral arteries?
The basilar artery
What does the basilar artery give rise to?
The posterior cerebral branches
What percent of the population presents with the normal configuration of the Circle of Willis?
50%
What percent of the cardiac output supplies the brain?
15%
Why is there little circulatory reserve?
Due to the brain’s high metabolic rate
What is needed in cerebral hemodynamics?
A constant supply of oxygen
What does the brain not have?
Significant oxygen or glucose stores
What is the brain entirely dependent on?
The vascular system for maintenance
What can bring on symptoms of cerebral dysfunction?
Short episodes of cerebral flow
How long does it take for cerebral death to occur?
3-8 minutes
What does the ICA supply?
The anterior circulation via the anterior and middle cerebral arteries
What does the ICA give rise to?
The posterior communicating arteries
What is the posterior circulation supplied by?
The vertebral arteries via the basilar artery
What does the posterior circulation give rise to?
The posterior cerebral arteries
What is the artery where a stroke occurs?
In the middle cerebral artery
What does the MCA supply? (2)
- Frontal cortex
2. Parietal cortex
What does the anterior cerebral artery supply? (3)
- Frontal lobes
- Medial aspects of the parietal lobes
- Medial aspects of the occipital lobes
