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Question: The outer membrane surrounding the brain is known as dura mater. The middle layer is known as the arachnoid layer and the inner layer is the pia mater. These three layers form the blood-brain barrier which determines which chemicals will reach the brain. true or false
False. While it's true that the outer membrane is known as the dura mater, the middle is the arachnoid mater, and the innermost is the pia mater, these layers are collectively known as the meninges, not the blood-brain barrier. The blood-brain barrier is a separate system that prevents certain substances in the blood from reaching the brain, but it is primarily made up of endothelial cells lining the brain's blood vessels, not the meninges.
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