Putamen, caudatenucleus, amygdala = purple. Thalamus = orange. ase of the forebrain (telencephalon). The putamen and caudate nucleus together form the dorsal striatum. It is also one of the structures that comprises the basal ganglia. Through various pathways, the putamen is connected to the substantia nigra and globus pallidus. The main function of the putamen is to regulate movements and influence various types of learning. It employs GABA, acetylcholine, and enkephalin.