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Overview Because the complex superior/inferior, send/receive relationship might be difficult to understand, it helps to envision the CNS as residing in command central. There the chief executive determines the correct course of action and then sends an order through the proper channels (a series of somatic motor neurons that conduct impulses along axons) to the cogs (skeletal muscles) that execute the action. As per the previous example, if the CNS gave the order to pull a trigger, the distal and mid-dle phalanges of the index finger would flex and -- bang -- a shot would fire. This chain of command is not only efficient, but also fully trustworthy, in that the CNS takes only actions it deems necessary to safeguard the body's comfort and survival. 
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Think, then, what would happen if the CNS were given complete control of all information as well as the power to wield it. The CNS would, for example: 1. be able to curtail any unsafe activity that might lead to bodily breaks or abrasions; 2. keep illness at bay by avoiding all diseased entities; and 3. nip any assassination attempt -- either for- eign or domestic -- in the bud. Thus taken care of, the body would find itself in a state of perfect and complete peace. Utopia, if you will. The Problem But at this point in humanity's evolution, the CNS does not possess and control all knowledge and power. Rather, it must share these assets  |
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