Length of hair cells as a measure of frequency representation in the mammalian inner ear?

Dannhof, Bernhard J.; Roth, Birgit; Bruns, Volkmar

doi:10.1007/bf01134454

Cited by 36 publications

(30 citation statements)

References 11 publications

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“…OHCs become shorter towards the basal turn, although lengths of OHCs in different rows also differ. In the guinea pig, cell length increases from about 20-90 lm, as best frequency decreases from 40 to 0.1 kHz (Dannhof et al, 1991). OHCs with lengths of 40-70 lm are located in the 2nd and 3rd turns (Guo et al, 2001), which corresponds well with noise-induced frequency damage region (Fig.…”

Section: The Noise-induced Pts May Results From Damage To Ohc Plasma Mmentioning

confidence: 85%

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Effects of intense noise exposure on the outer hair cell plasma membrane fluidity

Chen

Zhao

2007

Hearing Research

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Section: The Noise-induced Pts May Results From Damage To Ohc Plasma Mmentioning

confidence: 85%

“…5). Generally, OHC length is inversely related to best frequency in the basilar membrane (Dannhof et al, 1991). OHCs become shorter towards the basal turn, although lengths of OHCs in different rows also differ.…”

Section: The Noise-induced Pts May Results From Damage To Ohc Plasma Mmentioning

confidence: 98%

Effects of intense noise exposure on the outer hair cell plasma membrane fluidity

Chen

Zhao

2007

Hearing Research

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“…The material property values in Table I were taken from a number of sources ͑Smith, 1968; Lim, 1980;Miller, 1985;Steele et al, 1995;Karavitaki, 2002͒ and the dimensions in Table II were from the anatomical measurements for gerbil cochlea ͑Sokolich et al., 1976;Greenwood, 1990;Dannhof et al, 1991;Cohen et al, 1992;Edge et al, 1998;Thorne et al, 1999͒. The model is meshed into 1200 sections along the 12 mm length of the gerbil cochlea. Forty terms are used in the Fourier expansion across the width of the scala.…”

Section: Resultsmentioning

confidence: 99%

Intracochlear pressure and derived quantities from a three-dimensional model

Yoon

Puria

Steele

2007

The Journal of the Acoustical Society of America

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Intracochlear pressure is calculated from a physiologically based, three-dimensional gerbil cochlea model. Olson [J. Acoust. Soc. Am. 103, 3445-3463 (1998); 110, 349-367 (2001)] measured gerbil intracochlear pressure and provided approximations for the following derived quantities: (1) basilar membrane velocity, (2) pressure across the organ of Corti, and (3) partition impedance. The objective of this work is to compare the calculations and measurements for the pressure at points and the derived quantities. The model includes the three-dimensional viscous fluid and the pectinate zone of the elastic orthotropic basilar membrane with dimensional and material property variation along its length. The arrangement of outer hair cell forces within the organ of Corti cytoarchitecture is incorporated by adding the feed-forward approximation to the passive model as done previously. The intracochlear pressure consists of both the compressive fast wave and the slow traveling wave. A Wentzel-Kramers-Brillowin asymptotic and numerical method combined with Fourier series expansions is used to provide an efficient procedure that requires about 1 s to compute the response for a given frequency. Results show reasonably good agreement for the direct pressure and the derived quantities. This confirms the importance of the three-dimensional motion of the fluid for an accurate cochlear model.

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“…The frequencies that are encoded in a particular region depend on the stiffness of the basilar membrane (Von Békésy 1960;Dong and Olson 2009). However, other studies from terrestrial mammals show a relationship between the coding frequency and other structures such as the length of the OHC body (Dannhof et al 1991;Pujol et al 1992), cross-sectional area of the organ of Corti cells (Schweitzer et al 1996), ultrastructure of supporting cells (Spicer and Schulte 1994), or morphometrics of the reticular lamina (Yarin et al 2014). The morphometrics measured here for sensory cells and the distance between the IHCs and third row of OHCs in the apex of the beluga (Table 1; Figs.…”

Section: Discussionmentioning

confidence: 99%

Description of Cochlear Morphology and Hair Cell Variation in the Beluga Whale

Girdlestone¹,

Piscitelli-Doshkov²,

Ostertag³

et al. 2017

Arctic Science

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Environmental change and decreased ice cover in the Arctic make new areas accessible to humans and animals. It is important to understand how these changes impact marine mammals, such as beluga whales (Delphinapterus leucas Pallas, 1776). Hearing is crucial in the daily lives of cetaceans. Consequently, we need normal baselines to further understand how anthropogenic noise affects these animals. Relatively little is known about the inner ear morphology of belugas, particularly the organ of Corti, or hearing organ, found within the cochlea. The base of the cochlea encodes for high-frequency sounds, while low frequencies are detected in the apex. We showed differences between the apex, or centremost point of the cochlea, and the base, the region closest to the stapes. Our results showed that average outer hair cell density changed from 148 cells/mm in the apex to 117 cells/mm in the base. Cell width varied between the two regions, from 5.8 μm in the apex to 8.4 μm in the base. These results revealed variation throughout the cochlea, and thus the need to understand the basic morphology, to give further insight on hearing function in belugas and allow us to recognize damage if or when we find it.

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Length of hair cells as a measure of frequency representation in the mammalian inner ear?

Cited by 36 publications

References 11 publications

Effects of intense noise exposure on the outer hair cell plasma membrane fluidity

Effects of intense noise exposure on the outer hair cell plasma membrane fluidity

Intracochlear pressure and derived quantities from a three-dimensional model

Description of Cochlear Morphology and Hair Cell Variation in the Beluga Whale

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