Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 94 for “"Middle Ear"”.
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Middle ear development: Genetics and disease
The mammalian middle ear is composed of three bony ossicles, the malleus, incus, and stapes that function to conduct sound from the external to the inner ear. Normal development of middle ear structures is integral for transduction of sound, defects resulting in conductive deafness. Mice are …
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On Pressure Regulation of the Middle Ear
The middle ear (ME) pressure is regulated by gas diffusion over the ME mucosa and pressure equalizations via the Eustachian tube (ET). Disturbance in the regulation of ME pressure is believed to contribute to the development of chronic ear diseases. In this work subjects with chronic central …
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Treatment of early middle ear cholesteatoma by atticosinoplasty
BACKGROUND AND OBJECTIVES: Treatment of early cholesteatoma usually involves surgical modification of mastoid antrum and tympanum to prevent recurrence. Reconstruction of ossicular chain and the ear drum after complete elimination of cholesteatoma in tympanum improves hearing greatly. However, like …
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Characterizing middle ear reflectance via pole-zero fitting
This thesis characterizes middle ear complex acoustic reflectance (CAR) and impedance by fitting poles and zeros to real-ear measurements. The goal of this work is to establish a quantitative connection between pole-zero locations and the underlying physical properties of CAR data. Most previous …
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Downstream Signal Transduction Pathway in Human Middle Ear Cholesteatoma
OBJECTIVES: Human cholesteatoma in the middle ear is characterized by the presence of a keratinized epithelium which is believed to have the hyperproliferative property. The pathogenesis of cholesteatoma including its hyperproliferative characteristic is still unknown. The proliferation and …
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Analysis of exotic cat vocalizations and middle-ear properties
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.
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Fabrication and Testing of A Middle-Ear Implanted Microphone
Cochlear implants are devices that can restore hearing to people with sensorineural deafness. Despite their name, cochlear implants rely on an external unit which contains components such as a microphone. This work presents the design, fabrication, and testing of an implantable middle-ear …
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Investigation of respiratory surfactant A protein in middle ear epithelium
Introduction: The middle ear of mammals is an air-chamber required for sound transmission. It is lined by an epithelium which is variable but which resembles that of the lungs. Lung function depends upon surfactant which is a family of surfactant proteins which have an important role in breathing …
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Tuning of the middle ear in túngara frogs ( Engystomops pustulosus)
… communicate using sound, animals have to hear well in the frequency range of their calls. In frogs, body size is a major predictor of both the dominant frequency of the mating call, and the frequency of best sensitivity of the ear, which tend to match each other. Various pathways are known …
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The roles of pars flaccida in middle ear acoustic transmission
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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Non-invasive optical quantification of otitis media and middle ear effusions
… of non-invasive optical imaging in the middle ear. A clinical study was organized to observe the tympanic membrane of patients with normal, acute, and chronic infections in an attempt to identify differentiating characteristics of each infection state. Following this work, algorithms …
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Middle ear pressure gain and cochlear input impedance in the chinchilla
Measurements of middle ear conducted sound pressure in the cochlear vestibule PV have been performed in only a few individuals from a few mammalian species. Simultaneous measurements of sound-induced stapes velocity VS are even more rare. We report simultaneous measurements of VS and PV in …
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Role of middle-ear inertial component of bone conduction in chinchilla
… describes the mechanisms that produce a hearing sensation when the skull bones are subjected to vibration. Multiple components and pathways have been suggested to contribute to total bone-conducted sound. They include outer-ear cartilaginous wall compression, middle-ear inertia, fluid …
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The hearing abilities and middle ear functioning of the recreational scuba diver
… has increased in popularity over the past few years. It is believed that repeated exposure to the hyperbaric environment may have a long term effect on the auditory system. The research literature has given a lot of attention to acute injury but is very limited relating to the long term …
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Using otoacoustic emissions to measure the transmission matrix of the middle-ear
… the acoustic transmission matrix of the middle-ear using otoacoustic emissions. The experiment builds on previous work that uses distortion product otoacoustic emissions (DPOAEs) as an intracochlear sound source to drive the middle-ear in reverse. This technique eliminates the …
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Effects of ear-canal geometry and middle-ear pressure on wideband acoustic reflectance
… acoustic immittance (WAI) measurements of the middle ear are studied. The body of work presented here has three major components: (1) design of a hearing measurement probe and probe tip, (2) extraction of the effects of the residual ear canal (REC) and estimation of the WAI at the tympanic …
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