Raphe Nuclei

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This page will be update by the 27th of Auj. Ninad Mehta


During the mid-nineteen century it was observed that the serum that was left after the clotting of the blood could constrict vascular smooth muscle so as to increase the vascular tone. It was later discovered that blood platelets were a source of this substance. Rapport and this collaborators[1] later isolated this compound and named it serotonin(5-hydrocytryptamine). Since the structure of 5-HT is hydrophilic and this would imply that I would not be able to pass through the blood-brain barrier and thus the presence of 5-HT in the blood suggested that it was produced in the brain. In 1964, Dahlstrom and Fuxe using the method of histoflurescence found that the majority of serotonergic soma was found in the midline of the brainstem. This locus had been designated as the raphe nuclei[2]. One fact that must be kept in mind is that not all the neurons in the raphe nuclei are serotonergic.