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Monday, May 11, 2020 | History

2 edition of Studies of the distribution of cochlear potentials along the basilar membrane. found in the catalog.

Studies of the distribution of cochlear potentials along the basilar membrane.

L. U. E. KohlloМ€ffel

Studies of the distribution of cochlear potentials along the basilar membrane.

by L. U. E. KohlloМ€ffel

  • 218 Want to read
  • 8 Currently reading

Published by Distributed by Almqvist & Wiksell in Uppsala .
Written in English

    Subjects:
  • Cochlea.,
  • Basilar membrane.,
  • Electrophysiology.

  • Edition Notes

    StatementBy I. U. E. Kohllöffel.
    SeriesActa oto-laryngologica. Supplement 288
    Classifications
    LC ClassificationsQP461 .K64
    The Physical Object
    Pagination66 p.
    Number of Pages66
    ID Numbers
    Open LibraryOL5461542M
    LC Control Number73164121

    Along its entire length the membrane carries sense cells, receptors, like fine tapering columns with hairy points reaching up to a covering membrane. The receptor cells, or hair cells, transform the mechanical energy, represented by the vi- brations of the basilar membrane, into the specific form of energy which triggers the nerve impulses. Each position along the basilar membrane is most sensitive to a particular frequency of stimulation, arranged tonotopically along the membrane, where the higher frequencies stimulate the hair cells located in the basal area of the cochlea and the lower frequencies stimulate those hair cells located in the area of the cochlear by:

    Cochlear amplification has been most commonly investigated by measuring the vibrations of the basilar membrane in animal models. Several different techniques have been used for measuring these vibrations such as laser Doppler vibrometry, miniature pressure sensors, low coherence interferometry, and spectral-domain optical coherence tomography (SD-OCT). The organs of Corti lie on top of the basilar membrane, which is the side of the cochlear duct located between the organs of Corti and the scala tympani. As the fluid waves move through the scala vestibuli and scala tympani, the basilar membrane moves at a specific spot, depending on the frequency of the waves.

    The hallmark of mechanosensory hair cells is the stereocilia, where mechanical stimuli are converted into electrical signals. These delicate stereocilia are susceptible to acoustic trauma and ototoxic drugs. While hair cells in lower vertebrates and the mammalian vestibular system can spontaneously regenerate lost stereocilia, mammalian cochlear hair cells no longer retain this Cited by: Auditory neuropathy spectrum disorder (ANSD) refers to a range of hearing impairments characterized by deteriorated speech perception, despite relatively preserved pure-tone detection thresholds. Affected individuals usually present with abnormal auditory brainstem responses (ABRs), but normal otoacoustic emissions (OAEs). These electrophysiological characteristics .


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Studies of the distribution of cochlear potentials along the basilar membrane by L. U. E. KohlloМ€ffel Download PDF EPUB FB2

Get this from a library. Studies of the distribution of cochlear potentials along the basilar membrane. [L U E Kohllöffel]. Author(s): Kohllöffel,L U E Title(s): Studies of the distribution of cochlear potentials along the basilar membrane. Country of Publication: Sweden Publisher: Uppsala, Description: 66 p.

illus. Language: English MeSH: Cochlea/physiology* Notes: Summary in English, French, and German. NLM ID: [Book]. There are two primary factors that allow the cochlea to isolate frequencies. These are generally referred to as passive and active properties. tl;dr version: The passive properties are due to the mechnical properties of one of the membranes in the cochlea, the basilar membrane, primarily the width and stiffness at a given point.

The active properties are due to the vibration of a special. Four different techniques have now been used in making measurements of basilar membrane (BM) motion in different parts of the cochlea and in different species.

This paper will compare and contrast the data obtained and will attempt to relate them Cited by: Recent research on cochlear mechanics has revealed that the curved nature of the canal affects pressure distributions across the basilar membrane (Zhang et al.

) and might enhance a. Abstract. A wide range of acoustic frequencies and amplitudes present in the motion at the footplate of the stapes are analyzed and encoded in the cochlea for transmission to the central nervous system as all-or-none impulses in the fibers of the auditory by: Timothy C.

Hain, in Textbook of Clinical Neurology (Third Edition), Second‐Order Neuron. The cochlear nerve enters the brain stem at the pontomedullary junction, where it bifurcates and terminates in the two major subdivisions of the cochlear nucleus—the dorsal and ventral cochlear nuclei (Fig.

12‐2).The most important outflow is to the trapezoid body, which contains fibers. R.L. Jenison, in International Encyclopedia of the Social & Behavioral Sciences, 2 Auditory Nerve (AN) Auditory nerve fibers are ideally suited to take advantage of the cochlea's spatial frequency analysis due to nearly uniform innervations along the basilar membrane partition.

Between the basilar membrane and the tectorial membrane are hair cells that together form. Later theoreticians found that, given appropriate figures for elasticity and mass of the basilar membrane, cochlear mechanics could be fairly well described by a travelling wave of hydrodynamically coupled motion due to pressure differences across it, an effect that propagates along the sensing surface like a ripple on a pond –.

This idea of. In physiology, tonotopy (from Greek tono=frequency and topos = place) is the spatial arrangement of where sounds of different frequency are processed in the brain.

Tones close to each other in terms of frequency are represented in topologically neighbouring regions in the brain. Tonotopic maps are a particular case of topographic organization, similar to retinotopy in the visual system.

Introduction. Human auditory system is mainly composed of external auditory canal, middle ear and inner ear. When sound is transmitted to inner ear through external auditory canal and ossicular chain, the vibration of basilar membrane in the cochlea stimulates the hair cells, which will cause a variety of electrical changes in the cochlea, generates action potentials in the Author: Zhi Tang, Qiong Shen, Chang Xu, Xi Hou, Qian Wang, Zhi-hui Liu, Shu-jia Li.

Reflections on the role of a traveling wave along the basilar membrane in view of clinical and experimental findings Article in European Archives of Oto-Rhino-Laryngology (3). Figure 3 represents the basilar membrane velocity relative to the input level at two points along the cochlear partition.

The response was obtained by applying the model for a set of simple tones P 0 sin (2 π f t) with a frequency of Hz Cited by: 1. Personal reflections on the multichannel cochlear implant and a view of the future The filter bandwidths were similar to the frequency response characteristics of the cochlear basilar membrane.

The strategy also introduced the time delays required for each frequency to reach its site of maximum vibration along the basilar membrane, and it. Start studying Physio 3 Final - Physio 1 Questions. Learn vocabulary, terms, and more with flashcards, games, and other study tools.

BOOK REVIEWS Edited by M. BITTERMAN, University of California the spatial distribution of cochlear activity; and (4) the theories essentially depend on mechanical properties of specific areas along the basilar membrane which are supposed to be stimulated as individual resonators.

The Organ of Corti. The organ of Corti rests on top of the basilar membrane and contains specialized sensory epithelial cells called hair cells, which are organized into one row of inner hair cells and three rows of outer hair cells (Figure 1B).Classic studies on the development of the cochlear sensory domain have demonstrated the proneural transcription factor Atoh1 (red Cited by: 5.

fluid movement within the cochlea generated by sound stimulation that causes the basilar membrane to move. Different acoustic frequencies of stimulation will cause maximal displacement of the basilar membrane at different locations along its length.

This phenomenon is partially responsible for the cochlear tonotopic organization. Previous studies of cochlear CAP or basilar membrane motion noted that MOC shocks sometimes elicited a slow-onset, slow-offset “overshoot” characterized by supranormal response amplitudes in the post-shock recovery to baseline (Cooper and Guinan ; Sridhar et al.

However, it was assumed that this overshoot was part of the recovery. Among the many mechanisms by which sound may damage the cochlea is the reduction of cochlear blood flow (CBF).

The notion that very loud sound (continuous or impulse noise) has the ability to reduce blood flow comes from morphological studies of the status of blood vessels and the blood cells within those vessels following sound (e.g., Hawkins, ).

In this work, basilar membrane velocity (V BM), scala tympani intracochlear pressure (P ST), and cochlear input impedances (Z c) for gerbil and chinchilla are implemented using a three-dimensional hydro-dynamic cochlear model using 1) time-averaged Lagrangian, 2) push-pull mechanism in active case, and 3) the complex anatomy of cochlear scalae.Thoroughly updated for its Second Edition, this book provides an in-depth discussion on prosthetic restoration of hearing via implantation.

The text succinctly discusses the scientific principles behind cochlear implants, examines the latest technology, and offers practical advice on how to assess candidates, how to implant the devices, and what rehabilitation is most effective.The cochlear aqueduct is less widely open, as suggested in a study of temporal bones.

Only 34% of cochlear aqueducts were fully open while others presented their central lumen filled with connective tissues or bone.

The free passage of fluid along the Author: Fabian Blanc, Michel Mondain, Alexis-Pierre Bemelmans, Corentin Affortit, Jean-Luc Puel, Jing Wang.