Hideko Fujii-Hanamoto
Tokai University
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Featured researches published by Hideko Fujii-Hanamoto.
American Journal of Primatology | 2011
Hideko Fujii-Hanamoto; Mayumi Nakano; Hiroshi Kusunoki; Tomoo Enomoto
We performed histological analyses for comparing testicular microstructure between the gorilla, chimpanzee, and orangutan. Testicular samples were obtained by autopsy or biopsy from 10 gorillas, 11 chimpanzees, and 7 orangutans from several zoos and institutes. The seminiferous epithelia were thick in the chimpanzee and orangutan but thin in the gorilla. Leydig cells in the interstitial tissue were abundant in the gorilla. The acrosomic system was extremely well developed in the orangutans. Our study reveals that the cycle of seminiferous epithelium in orangutan testis can be divided into ten stages, whereas that in human, chimpanzee, and gorilla testes can be divided into only six stages. Phylogenetic analyses of the number of divisions may indicate that the seminiferous epithelium of our common ancestor has changed since the orangutan diverged from it. Furthermore, we performed comparative analyses of testicular microstructure to estimate relative sperm production among these three animals, and proposed a new indicator (namely the spermatogenic index, SI) closely related to sperm production. The SI indicated that a chimpanzee usually produces about 223 times more sperm than a gorilla and about 14 times more than an orangutan. Our data demonstrate the significance of the SI for estimating sperm production, thus aiding our understanding of the reproductive strategy as well as testis weight and relative testis size in investigated primates. Am. J. Primatol. 73: 570‐577, 2011.
Endocrinologia Japonica | 1988
Kou Sakabe; Kanji Seiki; Hideko Fujii-Hanamoto; Issei Kawashima
American Journal of Primatology | 2004
Tomoo Enomoto; Mayumi Nakano; Hideko Fujii-Hanamoto; Hiroshi Kusunoki
The Tokai journal of experimental and clinical medicine | 1990
Issei Kawashima; Kou Sakabe; Kanji Seiki; Hideko Fujii-Hanamoto
The Tokai journal of experimental and clinical medicine | 1990
Kou Sakabe; Issei Kawashima; Kanji Seiki; Hideko Fujii-Hanamoto
The Tokai journal of experimental and clinical medicine | 1990
Kanji Seiki; Kou Sakabe; Issei Kawashima; Hideko Fujii-Hanamoto
Pathophysiology | 1994
Kou Sakabe; Kanji Seiki; Issei Kawaschima; Hideko Fujii-Hanamoto; Rei Urano; Akira Akatsuka; Mayumi Nakano
The Tokai journal of experimental and clinical medicine | 1987
Kou Sakabe; Kanji Seiki; Hideko Fujii-Hanamoto; Issei Kawashima; Haruko Ogawa
Endocrinologia Japonica | 1986
Kou Sakabe; Kanji Seiki; Hideko Fujii-Hanamoto; Yasuo Haruki; Haruko Ogawa
Primate Research | 2010
Mayumi Nakano; Hideko Fujii-Hanamoto; Tomoo Enomoto; Hiroshi Kusunoki