Serotonin Connections in the Brain

Serotonergic projections in the human brain, arising from the raphe nuclei. The Serotonergic projections innervate sympathetic preganglionic neurons, the sensory glomeruli in olfactory bulb, the intermediate lobe of pituitary, the epithelial cells of choroid plexus, the lateral ventricles, the motor neurons of brainstem, the spinal cord, visual cortex and all regions of cerebral cortex. Other transmitter systems make specialized contacts with serotonergic targets: the dopaminergic neurons in substantia nigra, the noradrenergic neurons in locus coeruleus, pacemaker neurons of the suprachiasmatic nucleus, specialized calbindin GABA interneurons in hippocampus,and pyramidal cortical neurons. Cell types in close proximity to the serotonin fibers include glia,endothelial cells, ependymal cells in addition to the pineal gland and subcommissural...

https://www.researchgate.net/publication/6277269_Sodhi_MS_Sanders-Bush_E_Serotonin_and_brain_development_Int_Rev_Neurobiol_59_111-174#pf8