The serotonin receptors, also known as 5-hydroxytryptamine receptors or 5-HT receptors, are a group of G protein-coupled receptors and ligand-gated ion channels found in the central and peripheral nervous systems.  These long-range neurons have cell bodies distributed across nine brainstem nuclei, referred to as the raphe system, and axonal projections that collectively innervate most regions of the brain and spinal cord.  These brain cells make … Continue reading Researchers identify previously unknown subtypes of 5HT neurons.