Summary
Porichthys notatus has a long infundibular stalk, measuring 3 to 5 mm. The third ventricle extends into the stalk as a long infundibular funnel.
In several hypophysectomised specimens the proximal cut end of the stalk enlarged to form a round or oblong body, having axonal endings with AF-positive material, glial elements, and blood sinuses. This suggests that in the absence of the pituitary the cut end of the stalk is reorganised into a neurohypophysis-like organ.
The regenerated stalk seems to have the essential components for neurohypophysial function; axonal endings for the storage of secretory products, and related blood vessels for the release of the stored principles.
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This work was supported by the Population Council of the Rockefeller Institute, New York. I am thankful to Dr. R. L. Fernald, Director of the Friday Harbor Marine Biological Laboratories, University of Washington, for providing collection and laboratory facilities. I am indebted to Dr. Aubrey Gorbman, Department of Zoology, University of Washington for the generous hospitality in his laboratory and encouragement, which made this work possible. Material support in part for this research was received from U. S. P. H. S. grant NB 04887 awarded to Dr. A. Gorbman.
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Sathyanesan, A.G. The reorganization of the hypophysial stalk following hypophysectomy in the teleost Porichthys notatus Girard. Zeitschrift für Zellforschung 67, 734–739 (1965). https://doi.org/10.1007/BF00339299
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DOI: https://doi.org/10.1007/BF00339299