Multiple choice

Which of the following statements regarding the human brain is INCORRECT?

  1. Abnormalities of blood flow in the carotid arteries causes problems in the subcortical structures.

  2. Abnormalities of blood flow in the vertebral arteries cause problems in the brainstem.

  3. Formation of a local thrombus is one of the commonest causes of blood flow problems in the brain.

  4. At the base of the brain lies the circle of Willis.

  5. The carotid arteries form the posterior circulation to the brain.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

The carotid arteries form the anterior circulation to the brain, whereas the vertebral arteries merge to become the basilar artery (so called vertebrobasilar system), which constitutes the posterior circulation.

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