Serotonnin receptors

Most serotonin (5-hydroxytryptamine; 5-HT) pathways originate from cell bodies in the raphe or midline regions of the pons and upper brain stem; these pathways innervate most regions of the CNS. Multiple 5-HT receptor subtypes have been identified and, with the exception of the 5-HT3 subtype, all are metabotropic.