Neurotransmitters How Brain Cells Use Chemicals to Communicate

You'll have to read this at the URL; Only 2-3 pages long
http://www.sfn.org/index.aspx?pagename=brainBriefings_11_neurotransmitters
But it does bring up some fascinating questions; What happens to the neurotransmitter when the receiver does not exist? What needs to occur to grow that axon to another neuron to be able to send the message along? What a good use of
http://oc1dean.blogspot.com/2011/04/brain-mapping-techniques-for-evaluating.html or
http://oc1dean.blogspot.com/2011/03/microscope-captures-3d-movies-of-living.html or
http://oc1dean.blogspot.com/2010/11/wiring-diagram-of-brain.html
to follow the creation of new synapses to determine how to make then more efficient in neuroplasticity and neurogenesis. And maybe we can figure how out to direct neuron growth;
http://oc1dean.blogspot.com/2011/04/how-nerves-grow.html