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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 statement is correct in describing the three protective layers around the brain and spinal cord, known collectively as the meninges. The dura mater is indeed the outermost layer, the arachnoid mater is the middle layer, and the pia mater is the innermost layer. However, these layers do not form the blood-brain barrier. The blood-brain barrier is a separate system made primarily of specialized cells in the walls of brain capillaries and post-capillary venules. It regulates the passage of substances from the blood into the brain, not the meninges.
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