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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.
|Arthur C. Clarke|
The intelligent minority of this world will mark 1 January 2001 as the real beginning of the 21st century and the Third Millennium.
WORDS AND NUMBERS: MATHEMATICAL DIMENSIONS OF RHETORIC - how numbers function rhetorically by influencing persuasive appeals, the structure of messages, and our use of .language.