The three protective membrane layers that surround the brain and spinal cord: the dura mater (outermost), arachnoid mater (middle), and pia mater (innermost). These membranes provide cushioning, protection, and contain cerebrospinal fluid.
From Greek 'meninx' meaning membrane, originally referring to any thin skin or membrane. The term was first applied specifically to brain coverings in ancient Greek medicine by physicians like Galen.
Meningitis, the dangerous inflammation of these membranes, can kill within hours because these same protective layers can trap infection right next to your brain and spinal cord. The space between the arachnoid and pia mater contains cerebrospinal fluid that acts like a shock absorber for your most vital organs!
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