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International Journal of Morphology

On-line version ISSN 0717-9502

Abstract

RAMIREZ ARISTEGUIETA, Luis Miguel  and  BALLESTEROS ACUNA, Luis Ernesto. Human Oscicular Chain Articulations: Asymmetric Sound Transmission. Int. J. Morphol. [online]. 2010, vol.28, n.4, pp.1059-1068. ISSN 0717-9502.  http://dx.doi.org/10.4067/S0717-95022010000400012.

The mechanism for conducting acoustic energy via middle ear oscicles is still a controversial topic and will remain so until consensus is reached regarding whether it amplifies or reduces sound transmission. 22 paired human temporal bone blocks and 1 left block were studied. Digital measurements were taken of the tympanic membrane, oscicular articulations and the oval window; the results were then correlated. A relationship of non-lineal areas was found amongst the structures being studied, suggesting a sound transmission relationship combining both sound reduction and amplification. A complex relationship of levers could be observed originating in an oscicular and articular asymmetric relationship suggesting an amplifying function in initial sound transmission and also a final reducer destination for such conduction.

Keywords : Malleus; Incus; Stapes; Tympanum; Incudomalleolar joint; Incudostapedial joint; Oval window; Stapedial muscle.

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