Figure 26. Organization of the "ventral striatal system". This system is similar in organization to the other portions of the extrapyramidal system and includes a feedback loop involving a striatal element (the nucleus accumbens), a palidal element (the ventral palidum), a thalamic relay nucleus (the dorsomedial nucleus) and a source of dopamine (the ventral tegmental area). Note that dopamine acts on different types of receptors depending on the location.