The efferent fiber bundle of the substantia nigra transmits dopamine to one of the following areas

Connections in Basal ganglia Substantia nigra pars compacta (SNPC) to Striatum (Caudate nucleus & Putamen)- Dopaminergic Striatum to Substantia nigra pars reticulata (SNPR)- GABA Striatum to Globus pallidus inner segment & external segment- GABA Globus pallidus external segment to subthalamic nucleus and internal segment- GABA​ Subthalamic nucleus to Globus pallidus external segment and internal segment.- Glutamate​ Within the striatum- Cholinergic interneurons.