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The ear of the chameleon: The round window problem.

✍ Scribed by Wever, Ernest Glen

Publisher: John Wiley and Sons
Year: 1969
Tongue: English
Weight: 501 KB
Volume: 171
Category: Article
ISSN: 0022-104X
DOI: 10.1002/jez.1401710102

No coin nor oath required. For personal study only.

✦ Synopsis

A n examination of serial sections of the ears of several specimens of Chamaeleo senegalensis and ChamaeEeo quilensis gives support to a n earlier suggestion that these ears function by means of a substitute round window. The usual type of round window is absent, but there is a tortuous pathway leading from the scala tympani through the perilymphatic recess and then along the foramen of the glossopharyngeal nerve to' the air cavity of the middle ear.

This pathway makes possible a mobilization of the cochlear fluids in response to sound pressures exerted at the oval window by the columellar footplate. However, the mechanism is somewhat inefficient; the frictional resistance along the pathway reduces the amplitude of cochlear motion. The relatively poor sensitivity of these chameleon ears is thus largely accounted for.

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