[Afferent projections to the central superior raphe nucleus of brain stem and its relation to acupuncture anesthesia]

The afferent projections to the central superior raphe nuclus (CS) in the rat were investigated by means of HRP retrograte tracing method. 3% WGA-HRP 0.05-0.1 microliters was injected into the CS in each of 11 rats. The labeled cells were found in the medial part of lateral habenular nucleus, posterior hypothalamic area, lateral subnucleus of interpeduncular nucleus, dorsal raphe nucleus, periaqueductal gray matter, dorsal paramedial nucleus, preposital hypoglossal nucleus, dorsal paragiganto-cellular nucleus, magnum raphe nucleus, and fastigatum of cerebellum. The results provide morphological basis for researching function of the CS in acupuncture anesthesia.