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” …I am the light which shineth in darkness, and the darkness comprehendeth it not.”

     Doctrine and Covenants 6:21

    The Optic Nerves are the two most important cranial nerves in the body.  They account for 40% of all the sensory neurons in the entire nervous system, and contain 1 million nerve fibers each.  This is by far the most sensory input of any nerve in the body.   The trigeminal nerve, which gives our face its sense of touch, pain, temperature and vibration is a distant second at 140,000 nerve fibers.   The auditory nerve is third with just 30,000 nerve fibers.  By the numbers, vision is by far the most important sense in humans.  

      Most cranial nerves join into the very primitive part of the brain found in all mammals, called the brainstem.  The Optic and the Olfactory (smell) nerves and the only two that connect to the newer part of the brain, the neocortex, The folded, convoluted part that is far more developed in mankind than any other animal.   This turns out to be critical to the development of civilization itself. Read the rest of this entry »

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