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From Knowing Neurons blog. MRI scan showing in red the ventral tegmental area (VTA), a collection of cells that provide one of the main sources of dopamine.

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Illustration of the structures that compose the limbic system in the brain, including the amygdala, hippocampus, hypothalamus, nucleus accumbens, basal ganglia, and ventral tegmental area and substantia nigra.

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from Science News

Newly identified brain circuit could be target for treating obesity

WELL CONNECTED  Neurons (green) in the lateral hypothalamus connect with those in the ventral tegmental area of mice’s brains to contribute to compulsive sugar consumption.  ~~ Courtesy of Edward Nieh/MIT

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Gut Brain Connection. Approx 90% of the human body's total serotonin is located in the gut, where it is used to regulate intestinal movements. The remainder is synthesized in serotonergic neurons of the CNS, where it has various functions. These include the regulation of mood, appetite, and sleep. Serotonin also has some cognitive functions, including memory and learning. Modulation of serotonin at synapses is thought to be a major action of several classes of pharmacological…

Dopamine Pathways. In the brain, dopamine plays an important role in the regulation of reward and movement. As part of the reward pathway, dopamine is manufactured in nerve cell bodies located within the ventral tegmental area (VTA) and is released in the nucleus accumbens and the prefrontal cortex. Its motor functions are linked to a separate pathway, with cell bodies in the substantia nigra that manufacture and release dopamine into the striatum (Image Source: WIkipedia)

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Ventral Tegmental Area (VTA) is the area that synthesizes dopamine, which then sends to nucleus accumbens. Nucelus accumbens is the pleasure center, and it is stimulated by the neurotransmitter dopamine from VTA. VTA also sends dopamine to prefrontal cortex which regulates and controls these impulses. The locus coeruleus is the area packed with norepinephrine; and when stimulated by a lack of the addictive substance, will drives the person to do anything necessary to obtain a fix.

Dopaminergic neurons and their projections. Axons of dopaminergic neurons located in the substantia nigra pars compacta ascend rostrally as the nigrostriatal pathway and provide dopaminergic innervation to neurons located in the caudate nucleus and putamen (striatum). Axons of another group of dopaminergic neurons that are located in the ventral tegmental area ascend in the median forebrain bundle to provide dopaminergic innervation to the frontal and cingulate cortices.

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from Neuroscientifically Challenged

2-Minute Neuroscience: Suprachiasmatic Nucleus