This image and the one that follows show how neurotransmission works specifically for dopamine. What is schematically illustrated in this image is a nerve terminal (top), the synaptic cleft or space between the neurons, and the post-synaptic or receiving portion of a dendrite on a neighboring neuron. Dopamine is contained in vesicles (round storage sites) in the nerve terminal; dopamine receptors are present on the receiving (bottom) neuron.
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National Institute on Drug Abuse (July 1 2008). Neurotransmission. In Addiction Science: From Molecules to Managed Care. Retrieved from http://www.drugabuse.gov/publications/addiction-science/why-do-people-abuse-drugs/neurotransmission