Nervous System

Action Potential
http://outreach.mcb.harvard.edu/animations/actionpotential.swf

Helpful models of action potential

http://www.wickersham.us/anne/action.htm

CNS and PNS
http://thebrain.mcgill.ca/flash/d/d_01/d_01_cr/d_01_cr_ana/d_01_cr_ana.html
Nerves radiating from Spinal Cord
http://www.innerbody.com/image/nervov.html
National Geographic: Brain Anatomy http://science.nationalgeographic.com/science/health-and-human-body/human-body/brain-article.html
Time Magazine: Images of Brain Structure: http://cognitrn.psych.indiana.edu/busey/Q301/BrainStructure.html
Sensory, Motor, and Interneurons
http://www.biologymad.com/NervousSystem/nervoussystemintro.htm
Introduction to the Synapse
http://learn.genetics.utah.edu/units/addiction/reward/neurontalk.cfm