Title
Anatomical boundary of the tympanic membrane pars flaccida of the **Meriones unguiculatus** (Mongolian gerbil) Anatomical boundary of the tympanic membrane pars flaccida of the **Meriones unguiculatus** (Mongolian gerbil)
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Philadelphia, Pa ,
Subject
Physics
Human medicine
Source (journal)
The anatomical record. - Philadelphia, Pa, 1906 - 2002
Volume/pages
294(2011) :6 , p. 987-995
ISSN
0003-276X
ISI
000291439000010
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The pars flaccida of the Meriones unguiculatus (Mongolian gerbil) was in previous studies shown to bulge almost spherically when pressurized, a behavior suggesting that it is suspended by a fixed circular boundary. The question arises whether this functional boundary is based on an underlying circular anatomical boundary, an important issue for modeling the middle-ear mechanics. In this article, the boundaries of the Mongolian gerbil pars flaccida were visualized in situ with otomicroscopy and in slides with light microscopy and by micro-CT radiology. For the major part of its circumference, the pars flaccida was found to be suspended by rigid bone, that is, the tympanic legs. The remaining boundary is made up of the terminal portion of the handle of the malleus and the soft tissue of the terminal arches. The attachment to these structures is simple and uncomplicated, and the geometry is regular and symmetric: deviating by only 3.5% from a perfect circular shape. The findings justify the use of a fixed circular boundary as a good approximation for the modeling of pars flaccida deformation in the Mongolian gerbil.
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Handle