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Exotoses and cavernous venous formation in the external auditory canal of the hooded seal as functional physiological organ
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Surgical Sciences, Otolaryngology and Head and Neck Surgery.
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2000 (English)In: Acta Oto-Laryngologica, ISSN 0001-6489, Vol. 120, no 8, 940-943 p.Article in journal (Refereed) Published
Abstract [en]

Exostoses of the external auditory canal (EAC) develop after protracted mechanical, chemical or thermal irritation in particular. This is a common disorder among aquatic sportsmen and has been considered unique to Man. We dissected and photodocumented the EACs of 5 newborn and 3 adult Hooded Seals (Cystophora cristata). Serial sections of the EACs were prepared for light microscopic evaluation after staining with haematoxylin-eosin or toluidine blue. All EACs exhibited a firm, broad-based. mountain peak-shaped exostosis on the floor of the meatus, lateral to the eardrum. In addition, the meatal skin of the bony EAC harboured large venous sinuses. The exostosis and venous sinuses of the seal EAC participate in the protection of the sensitive hearing apparatus, particularly the pars tensa portion of the drum, during divine.

Place, publisher, year, edition, pages
2000. Vol. 120, no 8, 940-943 p.
National Category
Medical and Health Sciences
URN: urn:nbn:se:uu:diva-58512PubMedID: 11200588OAI: oai:DiVA.org:uu-58512DiVA: diva2:86421
Available from: 2008-10-17 Created: 2008-10-17 Last updated: 2013-10-25Bibliographically approved

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Anniko, Matti
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