Sub arachnoid

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Sub arachnoid (Wikipedia)
For the psychedelic rock band, see SubArachnoid Space.
Subarachnoid space
1316 Meningeal LayersN.jpg
Diagrammatic representation of a section across the top of the skull, showing the membranes of the brain, etc. ("Subarachnoid cavity" visible at left.)
Diagrammatic transverse section of the medulla spinalis and its membranes. (Subarachnoid cavity colored blue.)
Latin Spatium subarachnoideum,
cavum subarachnoideale
MeSH A08.186.566.166.686
TA A14.1.01.202
FMA 83716
Anatomical terminology

In the central nervous system, the subarachnoid space (subarachnoid cavity) is the anatomic space between the arachnoid mater and the pia mater.

It is occupied by spongy tissue consisting of trabeculae (delicate connective tissue filaments that extend from the arachnoid mater and blend into the pia mater) and intercommunicating channels in which the cerebrospinal fluid is contained.