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ventral tegmental area
The ventral tegmental area (VTA), (tegmentum is Latin for ''covering''), also known as the ventral tegmental area of Tsai, or simply ventral tegmentum, is a group of neurons located close to the midline on the floor of the midbrain (mesencephalon). The VTA is the origin of the dopaminergic cell bodies of the mesocorticolimbic dopamine system and is widely implicated in the drug and natural reward circuitry of the brain. It is important in cognition, motivation, orgasm, drug addiction, intense emotions relating to love, and several psychiatric disorders. The VTA contains neurons that project to numerous areas of the brain, from the prefrontal cortex (PFC) to the caudal brainstem and several regions in between.
==Anatomy==
Neurobiologists have often had great difficulty distinguishing the VTA in humans and other primate brains from the substantia nigra (SN) and surrounding nuclei. Originally, the ventral tegmentum was designated as a ‘nucleus,’ but over time ‘area’ became the more appropriate term used because of the heterogeneous cytoarchitectonic features of the region and the lack of clear borders that separate it from adjacent regions. Because of the selective limbic-related afferents to the VTA, the cells of the VTA are given the designation A10 to differentiate them from surrounding cells.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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