Relationships Between Semicircular Duct Radii With Some Implications for Time Constants

Relationships Between Semicircular Duct Radii With Some Implications for Time Constants RELATIONSHIPS BETWEEN SEMICIRCULAR DUCT RADII WITH SOME IMPLICATIONS FOR TIME CONSTANTS by M. MULLER (Department of Experimental Animal Morphology and Cell Biology Agricultural University, Marijkezueg 40, 6709 PG Wageningen) SUMMARY The aims of this paper are (1) to provide accurate, statistically founded and "generalized" morphological parameters of labyrinth parts which can be used in recently developed hydrodynamical models of endolymph and cupula movement (cf. OMAN et al., 1987; MULLER & VERHAGEN, 1988a, b), (2) to discuss the implications of duct length and radius, cupular stiffness, ampullar and utricular geometry on the time constants of the semicircular duct system, (3) to discuss the mutual influence of the terms of the equation of motion on the transducing properties of this system ("velocity"- or "acceleration" transducer). Original, new measurements of the outer radii of the semicircular ducts (a, p, h) crus commune (c) and utriculus (u) of 225 labyrinths are given, based on scaled draw- ings or photographs in three literature sources: RETZIUS (1881, 1884), GRAY (1907) and BIERBAUM (1914) together with the statistical data provided by RAMPRASHAD et al. (1980, 1984, 1986). No survey of this extent has been published. The measurements of the averaged inner radii of the ducts http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Netherlands Journal of Zoology (in 2003 continued as Animal Biology) Brill

Relationships Between Semicircular Duct Radii With Some Implications for Time Constants

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Publisher
Brill
Copyright
© 1989 Koninklijke Brill NV, Leiden, The Netherlands
ISSN
0028-2960
eISSN
1568-542X
D.O.I.
10.1163/156854289X00255
Publisher site
See Article on Publisher Site

Abstract

RELATIONSHIPS BETWEEN SEMICIRCULAR DUCT RADII WITH SOME IMPLICATIONS FOR TIME CONSTANTS by M. MULLER (Department of Experimental Animal Morphology and Cell Biology Agricultural University, Marijkezueg 40, 6709 PG Wageningen) SUMMARY The aims of this paper are (1) to provide accurate, statistically founded and "generalized" morphological parameters of labyrinth parts which can be used in recently developed hydrodynamical models of endolymph and cupula movement (cf. OMAN et al., 1987; MULLER & VERHAGEN, 1988a, b), (2) to discuss the implications of duct length and radius, cupular stiffness, ampullar and utricular geometry on the time constants of the semicircular duct system, (3) to discuss the mutual influence of the terms of the equation of motion on the transducing properties of this system ("velocity"- or "acceleration" transducer). Original, new measurements of the outer radii of the semicircular ducts (a, p, h) crus commune (c) and utriculus (u) of 225 labyrinths are given, based on scaled draw- ings or photographs in three literature sources: RETZIUS (1881, 1884), GRAY (1907) and BIERBAUM (1914) together with the statistical data provided by RAMPRASHAD et al. (1980, 1984, 1986). No survey of this extent has been published. The measurements of the averaged inner radii of the ducts

Journal

Netherlands Journal of Zoology (in 2003 continued as Animal Biology)Brill

Published: Jan 1, 1989

Keywords: labyrinth; endolymph; vestibular system; torsion pendulum; cupula; semicircular canals

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