PMID: 9560108Apr 29, 1998Paper

The cochlear aqueduct: an important landmark in lateral skull base surgery

Otolaryngology--head and Neck Surgery : Official Journal of American Academy of Otolaryngology-Head and Neck Surgery
A AslanM Sanna


The cochlear aqueduct (CA) is used as a landmark in lateral skull base surgery. In this study anatomic relationships between the CA and adjacent neurovascular structures were examined by dissecting 32 temporal bones. Observations of the relationship of the external opening (EO) of the CA with the ninth, tenth, and eleventh cranial nerves, inferior petrosal sinus (IPS), and intrapetrous carotid artery (ICA) were noted. In addition to the distance of the EO of the CA to the vertical portion of the ICA, the entire length of the CA and the width of the EO were also measured. The ninth nerve was the only structure lodged at the EO of the CA in 34.4% of bones. However, in 40.6% of bones only the IPS crossed the EO of the CA, although the ninth nerve was situated just anteroinferiorly in the vicinity of the EO. In 15.6% of bones it was possible to observe both the ninth nerve and the IPS crossing the EO. In 9.4% of bones the EO of the CA was found to be occupied by the tenth and eleventh nerves. It was also observed that the ICA was located anteriorly on the same sagittal plane with the EO in 15.6% of bones. It was concluded that although in 90% of cases the EO of the CA was in close relation with the ninth nerve, other structures suc...Continue Reading


Sep 1, 1977·The Annals of Otology, Rhinology & Laryngology. Supplement·H Rask-AndersenH Wilbrand
Apr 1, 1979·The Laryngoscope·G KelemenF Perez Olivares
Jan 1, 1986·Acta Radiologica: Diagnosis·C Muren, H Wilbrand
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Aug 1, 1970·Acta Oto-laryngologica·T Palva
Nov 1, 1995·Journal of Neurosurgery·S A AyeniA Hakuba
Jan 1, 1995·The Annals of Otology, Rhinology, and Laryngology·E SalehM Sanna
Jul 1, 1993·Otolaryngology--head and Neck Surgery : Official Journal of American Academy of Otolaryngology-Head and Neck Surgery·R K Jackler, P H Hwang

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