Just some extra notes...

I was just looking for some more information on the effects of narcotics on the myelin sheath and I found this: http://www.weizmann.ac.il/neurobiology/labs/ulanovsky/neuron2synapse/FromNeuronToSynapse_lecture5__Lampl__NeuronalExcitability_advanced__25april2010.pdf.  It has some really like pictures and diagrams if you would like to check it out!