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The distribution and morphological characteristics of the perikarya of serotonin (5-HT) neurons in the brain of the monkey (Macaca fuscata) were studied using a peroxidase-antiperoxidase immunohistochemical method. A wide and scattered distribution of 5-HT neurons was demonstrated in this study. Our immunohistochemical technique revealed for the first time 5-HT neurons in the following areas: the periaqueductal gray lateral to the nucleus raphe dorsalis, the field of the lemniscus lateralis, the nucleus parabrachialis medialis, the nucleus interpeduncularis and certain areas of the reticular formation.
Takeuchi et al. (Fri,) studied this question.