Learn That Word

Neurons.
Source: Geldwert, et Al. 'Dopamine presynaptically and heterogeneously modulates nucleus accumbens medium-spiny neuron GABA synapses in vitro.' BMC Neuroscience 7:53 (2006). http://en.wiktionary.org/wiki/File:Medium-spiny.jpg
Author: Geldwert, et Al.