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Tinnitus and Anatomical Correlates of the Auditory System: Peripheral; Central

Published online by Cambridge University Press:  27 March 2025

James B. Snow Jr.
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Extract

Tinnitus may be associated with lesions in the auditory system from the external auditory canal to the auditory cortex. So let's begin briefly, at first with the external auditory canal and move centrally. The external auditory canal has a slightly curved course. As one looks in, it is a course directed posteriorly and superiorly, then medially and finally anteriorly and inferiorly. The canal is oval in cross-section, with the long axis of this oval extending from anterior/superior to posterior/inferior. In the adult it averages 27 mm. in length. The outer 1/3 has a cartilaginous skeleton and the inner 2/3 has a bony skeleton. The bony canal wall is convexed anteriorly and inferiorly and this convexity obscures the anterior, inferior portion of the tympanic membrane. There are sebaceous glands and hair in the outer 1/3. The cartilaginous portion of the canal has transverse fissures in the anterior- inferior portion that are the fissures of Santorini.

Type
Session I—Anatomical and Physiological Considerations (Moderator: Max L. Ronis)
Information
The Journal of Laryngology & Otology , Volume 95 , Issue S4: Proceedings of the First International Tinnitus Seminar (New York, 8-9 June, 1979) , September 1981 , pp. 11 - 17
Copyright
Copyright © JLO (1984) Limited 1981

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