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
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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