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Unrenewable Cells

Unrenewable Cells

In humans, the photoreceptor cells of the eye and sensory hair cells of the ear lack stem cells. These cells are thus unrenewable and cannot be replaced when they are damaged or destroyed.
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The retina is composed of several layers and contains specialized cells called photoreceptors. The photoreceptors (rods and cones) change their membrane potential when stimulated by light energy. There are two types of photoreceptors—rods and cones—which differ in the shape of their outer...

Hearing

Hearing

When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.

Perception of Sound Waves

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The human ear is not equally sensitive to all frequencies in the audible range. It may perceive sound waves with the same pressure but different frequencies as having different loudness. Moreover, the perception of sound waves depends on the health of an individual's ears, which decays with age. The health of one's ears may also be affected by regular exposure to loud noises.
The pitch of a sound depends on the frequency and the pressure amplitude of the source. Two sounds of the same frequency...

Sound Intensity Level

Sound Intensity Level

Humans perceive sound by hearing. The human ear helps sound waves reach the brain, which then interprets the waves and creates the perception of hearing. The loudness of the environment in which a person is located determines whether they can distinguish between different sound sources.
The human ear can perceive an extensive range of sound intensity, necessitating the use of the logarithmic scale to define a physical quantity—the intensity level. It is a ratio of two intensities and hence a...

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Updated: Jun 22, 2026

Neuro-rehabilitation Approach for Sudden Sensorineural Hearing Loss

Neuro-rehabilitation Approach for Sudden Sensorineural Hearing Loss

Published on: January 25, 2016

[Hearing loss among handicapped persons].

Didier Bouccara¹, Olivier Sterkers

¹Service d'ORL, hôpital Beaujon, AP-HP, 92110 Clichy. d.bouccara@orange.fr

La Revue Du Praticien

|June 26, 2009

Summary

This summary is machine-generated.

Deafness impacts daily life differently based on hearing loss severity. Severe to profound hearing loss necessitates comprehensive evaluations for treatments like cochlear implantation, while milder cases benefit from hearing aids.

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Area of Science:

Audiology
Otolaryngology
Public Health

Context:

Deafness and hearing loss present varied challenges impacting daily living.
The severity of hearing impairment dictates the approach to rehabilitation and treatment.
Recent legislative efforts in France aim to improve life for individuals with disabilities, including deafness.

Purpose:

To outline the varying impacts of deafness based on severity.
To detail the multidisciplinary approach required for severe and profound hearing loss.
To highlight the role of audiological evaluations and handicap inventories in assessing individual needs.

Summary:

Mild to moderate hearing loss is often managed effectively with hearing aids.
Severe and profound hearing loss requires a multidisciplinary approach, including speech therapy and potential cochlear implantation.
Audiologic evaluations, utilizing specific handicap inventories, are crucial for understanding the personal impact of hearing loss.

Impact:

Provides a framework for understanding and addressing the diverse needs of individuals with hearing loss.
Informs healthcare professionals and policymakers on appropriate interventions and support systems.
Emphasizes the importance of personalized audiological assessment and tailored rehabilitation strategies.