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- Brain membranes
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- Pythagoras - three is the perfect number
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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.
Somewhere between a third and a quarter of all people living in America today were born between 1946 and 1965 and if you think you're tired of hearing about us, you should try being one of us.
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