PMID: 9165342May 1, 1997Paper

Anatomy of the normal human cochlear aqueduct with functional implications

Hearing Research
Q GopenS N Merchant

Abstract

There is great variation in published descriptions of the shape, size, and patency of the human cochlear aqueduct. The first part of this paper describes the anatomy of the normal human cochlear aqueduct as determined from a study of 101 temporal bones. Nineteen bones aged 0-1 years and approximately 10 bones per decade of life until age 100 years were examined. The aqueduct was found to have a funnel shaped aperture at the cranial end with a dural sheath extending into it for a varying distance. The rest of the aqueduct was filled with a meshwork of loose connective tissue, often with a central lumen within it. Four types of patencies were noted: central lumen patent throughout length of aqueduct (34%), lumen filled with loose connective tissue (59%), lumen occluded by bone (4%), and obliteration of the aqueduct (3%). The mean value (+/- SD) of the narrowest portion was 138 (+/- 58) microns which occurred 200-300 microns from the cochlear end of the aqueduct. There was no correlation between age and narrowest diameter, or between age and category of patency. In the second part of this paper, we propose quantitative models of aqueduct function, based on measurements of ductal dimensions and known acoustical properties of the in...Continue Reading

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