JOHN BAVOSI / SCIENCE PHOTO LIBRARY JOHN BAVOSI / SCIENCE PHOTO LIBRARY
Meningitis. Artwork of a section through the meninges of the brain with an inset picture of Neisseria meningitidis, a cause of meningitis. The meninges are the three membranes that cover and protect the brain (grey, top) and spinal cord (not seen). The outermost membrane is the tough dura mater (mauve) which lines the inside of the skull (brown). To the inside of this layer are the arachnoid and pia mater layers (blue). Between these layers flows the cerebrospinal fluid (yellow). Inflammation of the meninges (meningitis) occurs due to infection. Bacterial meningitis is most commonly due to infection with Neisseria meningitidis (inset).
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