Dopamine Pathways & Facial Expressions?

Alright, I'm still in the process of trying to get a full grasp of the concept, but I understand how there are 4 major dopamine pathways (at least 8 total), comprising of the mesolimbic, mesocortical, nigrostriatal, and tuberoinfundibular pathways (D1 through D4 I believe). Now, I understand how mental illnesses such as Parkinson's, and Schizophrenia occur when dopamine levels in the D1 pathway are higher than the levels in the D2 pathway, usually it's the other way around, right? Now, are these pathways somehow connected with the, I guess you could say, muscles involving motion/movement/positioning of the mouth and eyebrows? For instance, D2 controlling position/movement of mouth, D1 controlling position/movement of eyebrows. Perhaps this imbalance is what relates to the blunted emotions presented in schizo (effective disorder), and Parkinson's Disease. Anyone here familiar about the topic? thnks