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J Acoust Soc Am. 2005 Aug;118(2):861-71.

Acoustics of the human middle-ear air space.

Author information

1
Picker Engineering Program, Smith College, 51 College Lane, Northampton, Massachusetts 01063, USA.

Abstract

The impedance of the middle-ear air space was measured on three human cadaver ears with complete mastoid air-cell systems. Below 500 Hz, the impedance is approximately compliance-like, and at higher frequencies (500-6000 Hz) the impedance magnitude has several (five to nine) extrema. Mechanisms for these extrema are identified and described through circuit models of the middle-ear air space. The measurements demonstrate that the middle-ear air space impedance can affect the middle-ear impedance at the tympanic membrane by as much as 10 dB at frequencies greater than 1000 Hz. Thus, variations in the middle-ear air space impedance that result from variations in anatomy of the middle-ear air space can contribute to inter-ear variations in both impedance measurements and otoacoustic emissions, when measured at the tympanic membrane.

PMID:
16158643
DOI:
10.1121/1.1974730
[Indexed for MEDLINE]

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