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Related Concept Videos

The Cochlea01:13

The Cochlea

44.7K
The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
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Hearing01:31

Hearing

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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.
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The Auditory Ossicles01:11

The Auditory Ossicles

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The auditory ossicles of the middle ear transmit sounds from the air as vibrations to the fluid-filled cochlea. The auditory ossicles consist of two malleus (hammer) bones, two incus (anvil) bones, and two stapes (stirrups), one on each side. These bones develop during the fetal stage and are the ones to ossify first. They are fully mature at birth and do not grow afterward.
The aptly named stapes look very much like a stirrup. The three ossicles are unique to mammals, and each plays a role in...
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Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

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The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by...
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Auditory Pathway01:15

Auditory Pathway

5.4K
Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking...
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Anatomy of the Ear01:16

Anatomy of the Ear

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Auditory sensation, commonly called hearing, involves the transformation of sonic waves into neural impulses facilitated by the structures of the auditory organ. The prominent, flesh-like structure on the side of the head, called the auricle, directs sound waves towards the auditory canal. The auricle is often mislabeled as the pinna, a term more aligned with mobile structures like a feline's external ear. The auditory canal penetrates the cranium via the external auditory meatus of the...
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Otology: Hearing Loss.

Michael Tudeen1, Maribeth Porter Williams1, Frank A Orlando1

  • 1Department of Community Health and Family Medicine, University of Florida College of Medicine.

FP Essentials
|July 17, 2024
PubMed
Summary
This summary is machine-generated.

Hearing loss, a growing global health issue, is categorized by type and diagnosed via clinical evaluation and audiology tests. Recent legislation improves hearing aid accessibility and affordability.

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Area of Science:

  • Audiology
  • Otolaryngology
  • Public Health

Background:

  • Hearing loss represents a significant global health burden, exacerbated by aging populations, noise exposure, and chronic diseases.
  • The prevalence of hearing impairment is projected to rise, necessitating effective diagnostic and management strategies.

Purpose of the Study:

  • To outline the classification, diagnosis, and management of various types of hearing loss.
  • To highlight recent legislative changes impacting hearing aid accessibility and affordability.

Main Methods:

  • Diagnosis involves patient history, physical examination, audiometry, and tympanometry.
  • Advanced imaging is reserved for specific clinical indications.
  • Sudden sensorineural hearing loss requires urgent otolaryngologist and audiologist referral.

Main Results:

  • Management strategies vary based on hearing loss type, with corticosteroids considered for sudden cases.
  • Hearing aids offer substantial benefits for chronic hearing loss but have faced accessibility challenges.
  • New legislation facilitates direct-to-consumer sales and over-the-counter hearing aids, increasing affordability.

Conclusions:

  • Accurate diagnosis is crucial for appropriate hearing loss management.
  • Recent policy changes aim to mitigate the financial and accessibility barriers associated with hearing aids.
  • Addressing the increasing burden of hearing loss requires continued advancements in diagnostics and accessible assistive devices.