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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.
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|Herb O Buckand has an enormous interest in the structure of threes and has been collecting and examining these concepts for years. He has an exciting website for his Threseology Research Journal located at http://www.threesology.org. Here he delves into concepts in threes in many different areas. He is a true generalist.|