| The brain is, in many ways, a chemist's delight. This is so because it illustrates various general principles of biology applied to a highly specialized tissue that ultimately regulates all the other tissues of the body. This chapter highlights the differences between the central nervous system - that is, the brain and spinal cord - and the peripheral nervous system, which is outside the dura (the thick fibrous covering that contains the cerebrospinal fluid [CSF]).
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