from the nucleus of the solitary tract (Berridge, Stratford et al. 1997, Delfs, Zhu et al. 1998). Some MSNs within the NAc send their projections to the ventral mesencephalon (VM), while others innervate the ventral pallidum (VP). While the VM and VP projections have a superficial resemblance to the direct and indirect pathways, respectively, recent studies indicate that there is considerable mixing of MSN projections to the VP (Kupchik, Brown et al. 2015). Thus, the limbic striatal inputs and outputs are different from the dorsal striatal counterparts. The output from the limbic BG affects many parts of the limbic system, but also has more indirect influence on the associative and sensorimotor circuits. It should also be noted that parts of the limbic C-BG-C circuitry loop also include the extended amygdala network that will be described in a separate article in this volume. Our focus when discussing limbic circuitry will be on actions that differ from the negative affect/negative reinforcement functions described in that review.
