Summary
The fine structure of the hypothalamic floor was studied in the frog, Rana catesbeiana. The regions slightly anterior and posterior to the swollen hypothalamic floor part, which has been classically designated as the median eminence, contained neurosecretory axon terminals abutting on the capillary walls. The region relatively far anterior to the swollen part did not show neurosecretory axons terminating on capillary walls. The neural stalk contiguous to the rostral border of the pars intermedia had few neurosecretory axon terminals which end on the terminal portions of the ependymal processes covering the capillary wall. The functional significance of the regional differentiation of the frog neurohypophysis is discussed in connection with the regional differentiation of various secretory cells in the adenohypophysis.
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The author would like to express his appreciation to Professor Hideshi Kobayashi for the guidance of this study. It was supported by grants from the Ministry of Education of Japan and the Ford Foundation to Professor Kobayashi.
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Tsuneki, K. Ultrastructure of the neurohemal hypothalamic floor of the frog, Rana catesbeiana . Cell Tissue Res. 161, 11–24 (1975). https://doi.org/10.1007/BF00222110
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DOI: https://doi.org/10.1007/BF00222110