Abstract
THE median eminence and the true portal system of the higher vertebrates have not been observed in the teleost pituitary, although the blood vascular supply of the teleost pituitary has been described by Bretschneider and de Wit1, Green2 and Barrington3 in some detail. It is often reported that the pituitary gland in teleosts receives a direct blood supply from the internal carotid arteries and that the neurohypophysis and the adenohypophysis share a common vascularization. On this basis Green2 homologizes the neurohypophysis of the fish pituitary with the median eminence of the higher vertebrates. Barrington3 has attempted to show some degree of resemblance between the richly vascularized portion of the infundibulum of the minnow and the median eminence of Rana. However, he denies the existence of a true portal system in the minnow as most of the blood enters the gland directly through a ‘ring vessel’.
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References
Bretschneider, L. H., and de Wit, J. J. D., Sexual Endocrinology of Non-Mammalian Vertebrates (Amsterdam, 1947).
Green, J. D., Amer. J. Anat., 88, 225 (1951).
Barrington, E. J. W., Proc. Zool. Soc. Lond., 135, 551 (1960).
Belsare, D. K., J. Morph., 131, 151 (1963).
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BELSARE, D. Vascular Supply of the Pituitary Gland in Channa punctatus Bloch. Nature 206, 211 (1965). https://doi.org/10.1038/206211a0
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DOI: https://doi.org/10.1038/206211a0
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