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The surgical anatomy for multiple-electrode extracochlear implant operations

Published online by Cambridge University Press:  29 June 2007

Burkhard K-H. G. Franz  and
Graeme M. Clark
Burkhard K-H. G. Franz*
Affiliation:
Department of Otolaryngology, University of Melbourne, The Royal Victorian Eye and Ear Hospital, 32 Gisborne Street, East Melbourne 3002, Australia.
Graeme M. Clark
Affiliation:
Department of Otolaryngology, University of Melbourne, The Royal Victorian Eye and Ear Hospital, 32 Gisborne Street, East Melbourne 3002, Australia.
*
Department of Otolaryngology, University of Melbourne, The Royal Victorian Eye and Ear Hospital, 32 Gisborne St., East Melbourne, Australia.
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Abstract

Direct access to the whole length of the cochlear turns via endaural middle ear approach for the placement of extracochlear electrodes is severely restricted. Approximately 10 mm. of the cochlear turns are accessible, being less than a third of their length. The middle cranial fossa, the facial nerve, the internal carotid artery and the temporomandibular joint restrict the access. A further restriction is caused by the position of the cochlea and the direction of its axis. The anterior part of the cochlea lies anterior to the tympanic membrane and medial to the temporomandibular joint, thus limiting an endaural approach to a posterolateral direction. Despite this limitation small sections of the basal, middle and apical turns of the cochlea can be reached.

Type
Main Articles
Information
The Journal of Laryngology & Otology , Volume 102 , Issue 8 , August 1988 , pp. 685 - 688
Copyright
Copyright © JLO (1984) Limited 1988

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