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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.
|Richard M. Daley|
And then for the first time in history a Cook County state's attorney was reelected for a third time.
|If you have a broadband connection and are using the web browser Internet Explorer, you can view a sabbatical presentation by the author of The Book of Threes. He suggests threes exist simultaneously as simplification, completion and memory. Read more at http://sab.threes.com.|