Characteristic structures of serotonin neuron system

Summary Since 1982, the authors have carried out intensive immunohistochemical studies on the distribution of serotonin neurons in the central nervous system and have reported the distinctive structures of these nerve cells. In the present study, two characteristic findings are described with special regard to the histophysiological significance: (1) direct innervation of the cerebral arteries by central serotonin neurons and (2) the perineuronal ivylike serotonin plexus.Dedicated to Professor Dr. T.H. Schiebler on the occasion of his 65th birthdaySupported by grants from the Ministry of Education, Science and Culture of Japan (nos. 60440024, 61218015 and 61231026)