Blood supply to brain

Question 1

How does oxygenated blood mainly get into the brain?

Answer 1

• Carotid arteries

- Vertebral artery

Question 2

What are venous sinuses?

Answer 2

-Drain blood back into the veins in the neck

Question 3

What vessels supply the anterior part of the brain?

Answer 3

-From heart and aorta through internal and external carotid artery.

Question 4

What vessels supply the posterior part of the brain?

Answer 4

• Vertebral arteries.

- Basilar artery.

Question 5

Describe the Circle of Willis?

Answer 5

• It is interconnecting arteries at the base of the brain.
• Connects carotid and basilar to supply blood to whole brain.
• Internal carotid artery supplies anterior and middle cerebral arteries.
• Basilar artery supplies posterior cerebral arteries.

Question 6

Now grab a piece of paper and draw the Circle of Willis?

Answer 6

Label:

• Vertebral arteries
• Basilar artery
• Posterior cerebral artery
• Posterior communicating artery
• Middle cerebral artery
• Internal carotid artery
• Anterior communicating artery
• Anterior cerebral artery

Question 7

Describe the blood - brain barrier?

Answer 7

• Isolates CNS neural tissue from general circulation.
• Formed by network of tight junctions.
• Astrocytes control barrier by releasing chemicals that control permeability of endothelium.

Question 8

What is Cerebrovascular disease?

Answer 8

• A disorder which interferes with blood circulation to brain.
• Also known as a stroke or cerebrovascular accident (CVA).