著者
松本 真吏子 星野 知之 木倉 幹乃 黄川田 啓子 黄川田 徹
出版者
Japan Otological Society
雑誌
Otology Japan (ISSN:09172025)
巻号頁・発行日
vol.15, no.5, pp.633-638, 2005-12-25 (Released:2011-06-17)
参考文献数
8
被引用文献数
1

Objective: To examine measurements of the vestibular aqueduct on axial CT figures and to examine the cases with borderline EVA.Design: The width of the vestibular aqueduct was measured in two places, the midpoint of the duct and the external aperture in the posterior cranial fossa. Criteria was as follow: Enlargement ;≥1.5mm at the midpoint, ≥2mm at the aperture, Borderline; 1-1. 4mm at the midpoint, 1.5-1.9mm at the aperture.Participants: 345 cases with CT scans of the temporal bones taken during July 2003 to June 2004 in the secondary ENT referral center. Those Patients include sensorinearal, mixed or conductive deafness, vertigo, ear infections and other ear diseases.Result: Enlarged vestibular aqueduct was found in 10 ears with sensorinearal deafness (SD) and 2 ears without SD. Borderline measurements were found in 19 ears with SD and 33 ears without SD. The enlarged midpoint measurement was not seen in the cases without SD.Conclusions: More than 1. 5mm of the definition for the enlargement at the midpoint of the vestibular aqueduct seemed to be appropriate in the clinical situation. The measurement at the midpoint of the duct is more reliable than at the external aperture. The conductive component in EVA Syndrome with mixed hearing loss is present only at the lower frequencies (250, 500Hz), not at the middle and higer frequencies. Long-term follow-up of hearing should be done in the borderline cases with check-up of PDS gene anomaly if necessary.
著者
星野 知之
出版者
International Society of Histology and Cytology
雑誌
Archivum histologicum japonicum (ISSN:00040681)
巻号頁・発行日
vol.37, no.1, pp.25-39, 1974 (Released:2009-02-20)
参考文献数
15
被引用文献数
13 18

ネコとモルモット内耳のコルチ器と蓋膜との接続を走査電子顕微鏡で観察した. コルチ器は生後1ケ月の間さらに発育し変化するので, 生後1日から32日までのネコと成獣について調べた. 蓋膜の外側縁は生後まもない動物では3列目のダイテルス細胞に接続しているが, 生後20日目頃から次第に離れはじめる. 成獣ではもはやこの接続はみられなかった. 成獣では蓋膜下面に外毛細胞感覚毛の最長の1列の先端がささっている. 内毛細胞の感覚毛の先端は蓋膜にはささらず, 蓋膜は索状の構造物によって内毛細胞の近くと接続していると考えられたが, 生後10日のネコで, 蓋膜下面に感覚毛の先端がささっていたあとが認められた.