Noradrenergic neurons are chiefly present in:

Cells in the locus ceruleus have noradrenergic neurons that are projected to all pas of the cerebral coex and limbic system. It is involved in the regulation of attention, arousal, sleep-wake cycles, mood and affect. Raphe nucleicontain serotonergic neurons. These neurons fire most rapidly during wakefulness Nucleus accumbens and nigro-striatal pathway contain dopaminergic neurons.