Word: arachnoid
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Brain. Just within the bony brain case are the meninges made up of three separate coverings-the dura mater, the arachnoid and the pia mater. The dura mater (tough mother, protector) lies next to the skull and is closely connected thereto. It resembles fine, wetted parchment. Next and attached to this is the arachnoid (cobweb-formed). This is a thin, fibrous membrane, which one might compare to a slice from a rubber sponge. Through its interstices pass vital fluids. It connects the dura mater to the pia (tender, kind) mater which immediately covers the brain itself, and dips down into...
...Then into the skull bone with the saw. Slow, careful rasping. A six-inch triangle lay loose, like a piece of cracker on gelatin. With a blunt instrument Dr. Dandy separated this piece of bone from the underlying, attached dura mater. Into that tough membrane, into the arachnoid tissue, into the pia mater-carefully, very carefully. Some blood. The mass came loose like a slab of stale custard...