Hakkında
Michael O'Shea , Sussex Sinirbilim Merkezi Direktörüdür.
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Reklam
Alıntılar
The human brain has a confusing and complicated structural organization that certainly would not win awards for design. Unlike the eye, you cannot tell just by looking at it what the brain’s true purpose is.
The trend towards a true central nervous system received its most irresistible impetus with the evolution of animals with a bilaterally symmetrical body plan. Our ancestors had an elongated body and creeping lifestyle, feeding on organic matter on the sea f l oor. Having the mouth at the front facing downwards made this lifestyle easier and created a distinction between dorsal (top side), ventral (bottom side). The most important consequence of bilateral symmetry is that the front can be differentiated from the back – in effect inventing the head end. As most bilaterally symmetrical animals move in the forward direction, it made sense to concentrate the senses and the central nervous system at the head end, a phenomenon known as ‘cephalization’. After all, the front end will encounter opportunity, food, and danger first, explaining why the brain of most animals is at the front.
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