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The brain and medulla spinalis are enclosed within three membranes. These are named from without inward: the dura mater, the arachnoid, and the pia mater.
The dura mater is a thick and dense inelastic membrane. The portion which encloses the brain differs in several essential particulars from that which surrounds the medulla spinalis, and therefore it is necessary to describe them separately; but at the same time it must be distinctly understood that the two form one complete membrane, and are continuous with each other at the foramen magnum.
I turned down the first script offered to me, and the second. I lay on my back one day under an umbrella, in the garden, reading the third, and wondered why I had turned down the first.
The late Dr. Alan Dundes, Professor of Folklore and Anthropology at the University of California Berkeley writes on and on and on about things that come in threes.Read The Number Three In American Culture