ANAT: Blood supply of CNS

Question 1

Which 2 arteries supply the brain?

Answer 1

Internal carotid and vertebral (x 2, left and right)

Question 2

What are the branches of the internal carotid arteries?

Answer 2

• Ophthlamic artery - supplies the orbits
• Posterior communicating artery - connects the Circle of Willis
• Anterior cerebral artery
• Anterior choroidal - supplies limbic system, LGN, internal capsule
  
  • small calibre arteries to globus pallidus and hippocampus
• Hypophysial - releasing factors
• Turns in to the middle cerebral artery

Question 3

Label the Circle of Willis

Answer 3

Question 4

What is the purpose of the Circle of Willis?

Answer 4

• Can equalise pressure
• Can compensate for slow blockages

Question 5

Which territories are supplied by which branches of the cerebral arteries?

Answer 5

• Anterior cerebral artery - most of the frontal lobe
• Middle cerebral artery - some of the frontal lobe, lateral portion of temporal and parietal lobes
• Posterior cerebral artery - temporal and occipital lobes