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Question: true or false? 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 and false. The outer membrane surrounding the brain is indeed known as the dura mater, the middle layer is the arachnoid mater, and the innermost layer is the pia mater. However, these three layers form the meninges, not the blood-brain barrier. The blood-brain barrier is a separate system of blood vessels that helps to limit the passage of substances from the bloodstream into the brain to protect it from potentially harmful substances.
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