著者

森満 保 永井 知幸 井手 稔

出版者

THE JAPAN OTOLOGICAL SOCIETY

雑誌

Ear Research Japan (ISSN:02889781)

巻号頁・発行日

vol.14, no.1, pp.304-306, 1983 (Released:2011-08-11)

参考文献数

3

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In the early morning on Jan. 6, 1982, 135 cetaceans were found stranded alive at Aoshima Beach, Miyazaki, Japan. Since Aristotle reported on the strnading of dolphins, single or mass stranding of various kinds of cetaceans have been reported from many parts of the world. However, the reason for such mass stranding is not still fully explained to everyone's satisfaction.We have examined one of them and found a lot of parasites in the bilateral tympanic cavities. The parasites were identified to belong to the genus Nasitrema and closest to Nasitrema gondo Yamaguchi. The number of the parasites were over 30 in each ears, and the mucous membrane of the cavity was inflammed. The ossicular chain was fixed especially the stapes was fixed at the oval window. The periotic bone including the labyrinth was studied histologically. In the labyrinth pathological changes were minimum. However, the octavus nerve was inflammed and many eggs with triangular shape in cross section were found near the nerve. From the findings obtained, we would like to conclude that parasitogenic otitic and octavus neuropathy should be a possible cause of live mass stranding of cetaceans.

著者

永井 知幸

出版者

耳鼻

雑誌

耳鼻と臨床 (ISSN:04477227)

巻号頁・発行日

vol.48, no.1, pp.6-9, 2002

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滲出性中耳炎の鼓膜の知覚神経小体を透過型電子顕微鏡で観察した。正常の神経線維の他に、細胞内小器官に乏しい神経線維と電子密度の高い顆粒の詰まったシュワン細胞が散見された。滲出性中耳炎によって、鼓膜の知覚神経終末が変性する可能性が示された。慢性中耳疾患で耳管の調節された開閉運動のできない原因と考えられた。