Here’s a jazzy introduction from Discovery Channel, with a soundtrack inspired by Tubular Bells:

And now for the serious animations.

Neurons and Action Potentials:

Excellent Flash from  Children’s Hosital Boston

Good introduction from Harvard

Excellent comprehensive tutorial (Harvard Outreach)

Another good AP tutorial (can’t be saved) (Jordan Kerr University)

Generating Action Potential (MRothery, Watford Girls’ Grammar)

Comparing continuous and saltatory transmission (Matthews/Neurobiology)

Propagating an AP (McGraw Hill) (More from this source)

Synaptic Transmission:

Nice clear intro (McGraw Hill)

Another clear one (though missing the post-transmission ‘cleanup’) (BishopStopford)

Some Chemsketches of neurotransmitters (Harvey Project)

Neuromuscular Junction:

Neuromuscular junction step-through (Sinauer Associates)

Simple line-drawing animation (Harvey Project)

Muscle Contraction:

Nice animation of sliding filaments (Matthews/Neurobiology)

A good interactive diagram (Thomson/Brooks/Cole)

Neurotransmitters and Drugs:

Excellent, accessible overview from Jellinek, a Dutch drug education website

Good powerpoint from HHMI

Excellent overview of effects of drugs (Harvard)

Amphetamines, Cocaine, Nicotine as excitatory psychoactives (McGill ‘The Brain’)

Benzodiazepines, Cannabis, Alcohol as inhibitory psychoactives (McGill ‘The Brain’)

Parkinson’s Disease:

Short Introduction (from UPenn/ADAM)

Simple interactive – effects of lesions on inhibitory or excitatory ganglia (San Diego State College of Science)

Sample Questions: have a go at these NeuroBioHL_Qs