Crudely speaking, the nervous system is made up of two parts. The peripheral nervous system , composed of nerves and muscles , is rather robust and roams free, exposed to the elements. On the other hand, the central nervous system , consisting of the brain and spinal cord , is delicate and fragile. It is therefore protectively cocooned in a rigid skull and a hardy vertebral skeleton . But even this tough fortress isn’t secure enough for these dainty neurones ; they are, after all, the command and control system for the whole body. Therefore, to further insulate them from the physical and physiological perturbations that continuously threaten them, nature has further sequestered them within a very exquisitely regulated irrigation system, the cerebrospinal fluid (CSF) . Internet Archive book Images on Flickr. https://www.flickr.com/photos/internetarchivebookimages/14769907251/ The CSF is actually a fine filtrate of the blood that flows in the arteries. The sieve is the very for...
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