The substantia nigra contains dopamine-rich neurons that release dopamine into the striatum, which is involved in initiating and suppressing movements.

“so in the back of the brain there's an area called substantia so named because the neurons that are actually very dark they actually contain pigment you'd be able to see this if I were to slice up a brain you'd see two dark regions in the back that substantia Niagara substantia Niagara contains neurons that are chock a block full of dopamine but they release that dopamine in a brain structure called the striatum the striatum is involved in movement both the initiation of movements and the suppression of movements”