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The numbers thrown around at the end of the class last week impressed me.  The high percentage of interneurons really put the nervous system into perspective for me.  We experience the sensory neurons and motor neurons, and therefore, I think that we only seem to appreciate these neurons.  Yet, these peripheral neurons are less than .1% of all the neurons present in the body.  I think that this speaks volumes to the complexity of the nervous system and the high quality communication that must be taking place at extremely high speeds in order for the brain to properly receive and dictate a response.