This is called base chamber because after this midbrain , pons and medulla are present , so basically it acts like the base of the formal brain.
| caudate nucleus (DS) | snakebodychamber |
| putamen (DS) | snakeheadchamber |
| ventral striatum | |
| nucleus accumbens | |
| olfactory tubercle |
| globus pallidus or paleostriatum or dorsal pallidum | posterior yellow chamber |
| ventral pallidum | anterior yellow chamber |
| substantia nigra | black chamber |
black chamber has two parts pars reticulata and pars compacta. this black chamber has a black fibrous chamber and a black compact chamber.