Morphometric classification of neurosecretory granules in the neurohypophysis of the hagfish,Eptatretus burgeri |
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| Authors: | Kazuhiko Tsuneki Tohru Adachi Susumu Ishii Yoshihiko Oota |
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| Institution: | (1) Misaki Marine Biological Station, University of Tokyo, Miura, Kanagawa, Japan;(2) Misaki Marine Biological Station, University of Tokyo, Miura, 238-02 Kanagawa, Japan;(3) Department of Biology, School of Education, Waseda University, Nishiwaseda, Shinjuku, Tokyo, Japan;(4) Department of Biology, Faculty of Science, Shizuoka University, Ooya, Shizuoka-shi, Japan |
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| Abstract: | Summary Neurosecretory axons in the neurohypophysis of the hagfish, Eptatretus burgeri, were statistically classified into six types according to the size of secretory granules. These types are comparable with those in higher vertebrates. The concentration of each axon type is different in three regions: anterior dorsal wall, posterior dorsal wall, and ventral wall. The regional differences of the hagfish neurohypophysis are discussed in relation to the regional differentiation of the tetrapod neurohypophysis into the median eminence and the pars nervosa.We wish to express our appreciation to Professor Hideshi Kobayashi for the guidance of this study. It was aided by grants from the Ford Foundation and the Ministry of Education to Professor H. Kobayashi, and also by grants from the Population Council, New York and the Ministry of Education to Professor S. Ishii. |
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| Keywords: | Neurosecretory granules Morphometric classification Neurohypophysis Hagfish Eptatretus burgeri Electron microscopy |
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