The occurrence of the preoptic neurosecretory cells in the diencephalic ventricle of the arctic lamprey, Lampetra japonica.
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概要
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Lampreys, a representative of the most primitive living vertebrates, have a definite preopticohypophysial neurosecretory system in their diencephalon comparable to that of higher vertebrates (Sterba, 1972). As was shown in previous papers (Öztan and Gorbman, 1960; Tsuneki and Gorbman, 1975a; Nakai et al., 1979; Yui and Honma, 1979), the preoptic nucleus of lampreys contains so-called cerebrospinal fluid (CSF)-contacting neurons which project their dendritic process into the ventricular cavity. During the course of our anatomical studies on the brainventricular system of the arctic lamprey, <I>Lampetra japonica</I> (Chiba et al., 1981; Chiba and Honma, 1986a), the preoptic neurosecretory cells, which should be better-called intraventricular perikarya according to Vigh-Teichmann and Vigh (1983), were encountered. In spite of extensive studies on the periventricular structures of the brain of the arctic lamprey (Honma, 1969; Honma and Honma, 1970; Ochi and Hosoya, 1974; Tsuneki, 1974; Tsuneki et al., 1975; Shioda et al., 1977; Nakai et al., 1979; Yui and Honma, 1979; Chiba et al., 1981; Yamamoto et al., 1983; Chiba and Honma, 1986a; Ushiki et al., 1986), no cytological details of such intraventricular perikarya have been described.<BR>In this short communication, we report ultrastructural features of the intraventricular neurosecretory perikarya in the lamprey brain, along with a brief discussion on a possible role of the cells in neuroendocrine integration.
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