Disconnected from input and output, a computer's control unit would be useless. Similarly, your brain depends on nerves that wire it up to the body's sense organs and muscles. This chapter looks beyond the brain to the broader wiring of the nervous system, then investigates nerve cells and how these sen......

From brain and spinal cord, nerves divide and subdivide, supplying almost every cranny of the body. Anatomists have devised various methods of grouping these nerves that run outside the central nervous system. The simplest way of looking at them is to use the name "peripheral nerves" for all twelve pairs of cranial nerves projecting from the brain.(though some are strictly speaking brain tracts) and all 31 pairs of nerves rooted in the spinal cord........

If you haven't already noticed, a digital nervous system is being established at this very moment - that is, the modern technology of the internet. Like any nervous system, it allows messages to be sent to all people in any part of the world, just like in the body, where nerve impulses can be sent to any part of the body.......