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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.

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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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Ντοπαμίνη - ικανοποίηση. the reward circuit nucleus accumbens ventral pallidum ventral tegmental area and amygdala

the-reward-circuit-nucleus-accumbens-ventral-pallidum-ventral-tegmental-area-and-amygdala

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2-Minute Neuroscience: Suprachiasmatic Nucleus

Locations of the substantia nigra and the ventral tegmental area in the midbrain