The linings of the brain. (The linings of my brain, they give me such pain.) The linings of my brain are three in number and are called collectively the meninges. They surround it on the outside. The innermost is called the pia mater. It is a delicate, fibrous, and highly vascular membrane (gorged with veins and capillaries, I suppose). I feel pressure against it from inside. Things bubble and shove against it as though they might explode. It reminds me at times of a cheese fondue. The pia mater, reinforced by the two supporting layers, the arachnoid and the dura mater, holds fast against the outward expanding pressure of my brain, pushes back. At times, there is pain. The name pia mater derives from an imperfect translation into Latin of Arabic words that meant (ha, ha) tender mother.
– Joseph Heller, Something Happened (Knopf, 1974, p. 541-42)