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The question talks about brain.
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Here we talk about the blood supply.
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Blood supply to brain is a crucial method and a crucial function because when blood supply happens to the brain, the brain functions.
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Now brain is going to receive blood from two places.
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The first one is known as the the internal carotid arteries and the other one is known as the vertebral arteries.
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So from these two arteries, pair of arteries, the brain is going to receive the blood and when both of these arteries, the internal carotid artery and the vertebral arteries, when they join together, after joining, they form the circle of willis.
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They form the circle of willis and this circle of willis actually is going to ensure constant supply of blood to the brain.
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Now coming to the blood brain barrier.
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Blood brain barrier...