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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.
They say a person needs just three things to be truly happy in this world: someone to love, something to do, and something to hope for.
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