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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.
|Thomas J. Watson|
Really big people are, above everything else, courteous, considerate and generous - not just to some people in some circumstances - but to everyone all the time.
Human beings use threes to conceptualize everything. Three data
points are enough to describe an entire set. Take time for example. We
break it into before, during, and after. Look at the basic structure of