Gr��enverh�ltnisse der Scala vestibuli und die Fl�cheninhalte beider Treppen

Abstract

Height and width of the scala vestibuli were measured on resin casts at seven different places, beginning at the round window up to 1 3/4 turns of the cochlea. These figures do not decrease continuously but are augmented at certain places. The sectional areas of both scales show the same result according to the transient increases of height and width.

Automated analysis of human cochlea shape variability from segmented μ CT images

“…In order to evaluate the internal dimensions of the cochlea, cross-section measurements were performed in radial planes (a.k.a mid-modiolar cross-sections) (Zrunek et al, 1980;Zrunek and Lischka, 1981;Erixon et al, 2009), in parallel planes such as histological sections (Biedron et al, 2010) and in planes normal to the centerline (Poznyakovskiy et al, 2011;Avci et al, 2014). This last method does not induce measurement errors (e.g.…”

“…Methods using several type of plastic casts have been widely employed to evaluate the dimensions of cochlear anatomy (Zrunek et al, 1980;Zrunek and Lischka, 1981;Dimopoulos and Muren, 1990;Hatsushika et al, 1990;Wysocki, 1999;Erixon et al, 2009;RaskAndersen et al, 2011), but they do not allow accurate preservation of the geometric relationships of fragile cochlear structures and artifact-free measurements. Microdissections enable measurements of basic external dimensions of the cochlea like the width of the cochlear base (Wright and Roland, 2005), but as plastic casts, it cannot provide detailed three-dimensional reconstruction.…”

“…Previous analyses include measurements of the length of the cochlea and the number of cochlear turns (Hardy, 1938;Kawano et al, 1996;Skinner et al, 2002;Escudé et al, 2006;Stakhovskaya et al, 2007;Erixon et al, 2009;Gunz et al, 2012;Shin et al, 2013;van der Marel et al, 2014), measurements of the heights, widths and sectional areas of the scala tympani (Zrunek et al, 1980;Zrunek and Lischka, 1981;Hatsushika et al, 1990;Gulya and Steenerson, 1996;Wysocki, 1999;Thorne et al, 1999;Biedron et al, 2010;Avci et al, 2014), the scala vestibuli (Zrunek and Lischka, 1981;Gulya and Steenerson, 1996;Wysocki, 1999;Thorne et al, 1999;Biedron et al, 2010) and the cochlea (Erixon et al, 2009;Shin et al, 2013), measurements of the radial component of the cochlear centerlines (also called cochlear curvature) (Cohen et al, 1996;Baker, 2008;van der Marel et al, 2014), and studies of the longitudinal component of the centerlines of the scala tympani (Avci et al, 2014) and the cochlea itself (Verbist et al, 2009).…”

Electric-Acoustic Stimulation of the Auditory System: A Review of the First Decade

“…Deeper implantations beyond this point demonstrated various degrees of apical trauma [Gstoettner et al, 1999;Adunka and Kiefer, 2006]. The exact mechanisms of apical trauma are not yet entirely understood but seem to correlate with scala tympani dimensions and the fact that most current CI electrodes are too large for this region of the cochlea [Zrunek and Lischka, 1981;Wysocki and Skarzynski, 1998]. Also, the shape of the lateral wall of the scala tympani often causes the electrode to push against the basilar membrane.…”

A segmentation method to obtain a complete geometry model of the hearing organ

“…For this purpose, we have plotted a line onto the surface of the scala tympani in the middle of the basilar membrane and measured these two parameters at intervals of 2000 mm. Subsequently, we compared our results with the data given by Wysocki (1999), Hatsushika et al (1990, Zrunek and Lischka (1981) and Thorne et al (1999).…”