D1 and D2 receptor expressing striatal medium spiny neurons (MSNs) are ascribed to striatonigral ("direct") and striatopallidal ("indirect") pathways. respectively. that are believed to function antagonistically in motor control. Glutamatergic synaptic transmission onto the two types is differentially affected by Dopamine (DA). https://www.chiggate.com/aptamil-allerpro-syneo-2-900g-online-now/