日本産イワナ属魚類に関する研究-3-ニッコウイワナの下垂体血管系と神経分泌系〔英文〕

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The vascular supply to the hypothalamo-hypophysial region of the Japanese char, the Nikko-iwana, Salvelinus leucomaenis pluvius, was examined histologically after vascular injection with Chinese ink. In the present species, neither a true hypophysial portal vessel system which connects the hypothalamus with the pars distalis nor a portal system-like structure between neurohypophysis and adenohypophysis. The branches of the anterior cerebral arteries from the internal carotid artery supply the blood to the hypothalamic region, and the branches from the posterior cerebral arteries which direct anterolaterally provide the blood for the hypophysial region. Two main hypophysial arterial systems are detected, since the posterior cerebral artery divides itself into an anterior vascular plexus and posterior fine branches after pass through the pituitary stalk. The anterior vascular plexus forms the blood sinuses and projects into the region of adenohypophysis, and the latter invades deeply into the neurohypophysial digits. CH- or AF-positive neurosecretory granules from the nucleus preopticus concentrate on the wall of veins found in the digits of the pars nervosa. On the other hand, acid fuchsin positive neurosecretory axons from the nucleus lateralis tuberis are distributed chiefly around vascular plexus located near pars distalis. Accordingly, a possible role for this vascular plexus which is analogous to that of the hypothalamic portal vessel system and the gonadotropic activity of the hypophysis is intimated.
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日本産イワナ属魚類に関する研究-3-ニッコウイワナの下垂体血管系と神経分泌系〔英文〕

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