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The raphe nucleus (Latin for the 'bit in a fold or seam') is a moderately sized cluster of neurons found in the brainstem, and releases serotonin to the rest of the brain. SSRI ( Selective_serotonin_reuptake_inhibitor) Antidepressants are believed to act at these neurons.

related subjects

"A Lecture, Higher Brain Function: Activation of the Brain and Levels of Consciousness" http://faculty.etsu.edu/currie/ras.htm
"locus ceruleus" Locus ceruleus
"substantia nigra" Substantia nigra

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