This is accomplished through the secretion of the excitatory neurotransmitter acetylcholine(ACH) and the inhibitory
neurotransmitter dopamine. Dopamine is a neurotransmitter produced in the substantia nigra and in the adrenal glands. It is then transmitted to the basal ganglia when needed. ACH is
produced in the basal ganglia and transmits excitatory messages throughout this area .