Microbiology and Immunology 2500A/B Lecture Notes - Cerebrospinal Fluid, Arachnoid Mater, Pia Mater

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Ending with itis" usually refers to inflammation. Meningitis is an inflammation/infection of the meninges. It is usually due to a viral or a bacterial infection. Viral meningitis tends to be less severe than bacterial meningitis and can usually be resolved with a specific treatment. While on the other hand, bacterial meningitis can be extremely severe (very dangerous) Meninges they are the membranes that envelop the central nervous system (cns) which includes the brain and the spinal cord. This includes: dura mater, arachnoid mater & pia mater. Dura mater closest to the skull (thicker layer) Arachnoid mater between dura mater & pia mater. Pia mater closest to the brain (thin, delicate membrane) Between the arachnoid and pia maters contains a little space which is filled by the cerebral spinal fluid. Blood brain barrier (bbb) it is a protective cellular structure that restricts the passage of chemicals, toxins and microorganisms from the blood to the cns.

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