Title
A single-ossicle ear : acoustic response and mechanical properties measured in duckA single-ossicle ear : acoustic response and mechanical properties measured in duck
Author
Faculty/Department
Faculty of Sciences. Biology
Faculty of Sciences. Physics
Research group
Functional Morphology
Biophysics and Biomedical Physics
Publication type
article
Publication
Amsterdam :Elsevier science bv,
Subject
Physics
Biology
Human medicine
Source (journal)
Hearing research. - Amsterdam
Volume/pages
340(2016), p. 35-42
ISSN
0378-5955
ISI
000386417900005
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
To date, the single-ossicle avian middle ear (ME) is poorly understood, despite its striking resemblance to the design of many currently used ossicular replacement prostheses. This study aims to improve comprehension of this system. The acoustic response and the mechanical properties of the mallard middle ear were studied by means of optical interferometry experiments and finite element (FE) simulations. A finite element model was constructed based on μCT data and validated using the experimental results. Stroboscopic holography was used to measure the full-field displacement of the tympanic membrane (TM) under acoustic stimulation, and the transfer function was obtained with laser Doppler vibrometry. A sensitivity analysis concluded that the most influential parameters for ME mechanics are the elasticity of the TM, the extracolumella (the cartilaginous part of the columella) and the annular ligament of the columellar footplate. Estimates for the Young's modulus of the TM were obtained by iteratively updating the FE model to match experimental data. A considerable inter-individual variability was found for the TM's elasticity. Comparison of the experimental results and the optimized FE model shows that, similar to the human middle ear, damping needs to be present in the TM to describe the specific spatial and frequency dependent vibrations of the TM. In summary, our results indicate which mechanical parameters are essential to the good functioning of the avian ME and provide a first estimation of their values.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/609529/130409.pdf
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