|Diagrammatic transverse section of the medulla spinalis and its membranes. (At border, dura mater is black line, arachnoid mater is blue line, and pia mater is red line.)|
|The medulla spinalis and its membranes.|
The morphology of the brain in meningococcal meningitis is said to be covered by exudate on the surface of, and within the leptomeninges. Because the arachnoid is connected to the pia by cob-web like strands, it is structurally continuous with the pia, hence the name pia-arachnoid or leptomeninges.
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