ハゼClevelandia ios の幼魚の視床下部 : 脳下垂体神経分泌系に対する脳下垂体摘出と海水の塩分濃度変化の影響

概要

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A diagram of the hypothalamo-hypophysial neurosectretory system of Clevelandia ios is presented in Figure 1. Five days after hypophysectomy in the young goby (2.0-2.5cm in body length), Clevelandia ios, neurosecretory material was accumulated at the proximal cut ends of the axons originating in the neurosecretory cells of the preoptic nucleus. Herring bodies were frequently observed in the axons. In Figure 3, NA, NM and BV show the neurosecretory axons, accumulated neurosecretory material and blood vessel, respectively. The sign of cross (X) shows the original position of pituitary body. By nine days following hypophysectomy, the accumulation of neurosecretory material at the cut ends disappeared, and the neurosecretory granules in the neurosecretory cells and the Herring bodies in the axons decreased in number. The disappearance of neurosecretory material from the cut ends were discussed in comparison with normal releasing mechanisn of neurosecretory granules from the axon endings. The amount of neurosecretory material in the neurosecretory cells of the preoptic nucleus (Fig. 2) and in the neurohypophysis was not affected by keeping the young gobies in either sea water containing NaCI at concentrations of 2, 5 and 7% or sea water diluted to 1/2 and 2/3 with distilled water. The results were discussed in relation to their habitats, especially to their euryhalinity.
社団法人日本動物学会の論文
1963-01-15