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The Measurement of the External Auditory Canal Taeko Okuno 1 1Department of Otolaryngology, Faculty of Medicine, University of Tokyo pp.627-632
Published Date 1988/8/20
DOI https://doi.org/10.11477/mf.1411200197
  • Abstract
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The length, width and angle of the normal human external auditory canal were measured using computed tomography.

Total length of the canal was measured : an-terior wall 34.5 mm, posterior wall 23.8 mm, superior wall 25.7 mm and inferior wall 30.0 mm. The proportion of the bony part/cartilagenous part was calculated: anterior 0.7, posterior 1, 2, superior 0.5 and inferior O.8.

The width of the canal was 10.4 mm × 12.4mm at the external orifice, 8.7 mm × 8.8 mm at the outer edge of the bony part and 9.1 mm × 9.1 mm at the annulus of the drum. The isthmus of the canal was located at the center of the bony canal anteroinferiorly and at the annulus of the drum posterosuperiorly. The width of the canal was 4.5 mm × 4.8 mm at the isthmus.


Copyright © 1988, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1316 印刷版ISSN 0914-3491 医学書院

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