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Related Concept Videos

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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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.
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Auditory Perception01:17

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The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the...
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Hearing01:31

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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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Communication01:03

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Communication between two animals occurs when one animal transmits an information signal that causes a change in the animal that receives the information. Organisms communicate with one another in a host of different ways. Signals can be auditory, chemical, visual, tactile, or a combination of these. Communication is a critical behavioral adaptation that promotes survival, growth, and reproduction.
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What is a Sensory System?01:31

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Sensory systems detect stimuli—such as light and sound waves—and transduce them into neural signals that can be interpreted by the nervous system. In addition to external stimuli detected by the senses, some sensory systems detect internal stimuli—such as the proprioceptors in muscles and tendons that send feedback about limb position.
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Related Experiment Video

Updated: Jan 20, 2026

Cochlear Implant Surgery and Electrically-evoked Auditory Brainstem Response Recordings in C57BL/6 Mice
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Auditory synaptopathy, auditory neuropathy, and cochlear implantation.

Aiden Eliot Shearer1, Marlan R Hansen1,2

  • 1Department of Otolaryngology-Head and Neck Surgery University of Iowa Carver College of Medicine Iowa City Iowa U.S.A.

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|August 28, 2019
PubMed
Summary

Cochlear implants work best when hearing loss stems from the cochlea, not the auditory nerve. Understanding genetic causes of auditory neuropathy spectrum disorder (ANSD) improves patient counseling and predicts cochlear implant success.

Keywords:
Cochlear implantsauditory neuropathy spectrum disordergenetics

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Area of Science:

  • Neuroscience
  • Genetics
  • Otolaryngology

Background:

  • Cochlear implantation (CI) is standard for severe-to-profound hearing loss.
  • Auditory neuropathy spectrum disorder (ANSD) involves impaired auditory nerve function.
  • Genetic factors significantly influence ANSD and CI outcomes.

Purpose of the Study:

  • To review genetic mechanisms causing ANSD.
  • To analyze the impact of genetic lesions on CI outcomes.
  • To propose a molecular classification for improved patient counseling.

Main Methods:

  • Literature review of genetic lesions in ANSD.
  • Analysis of studies correlating genetic defects with CI performance.
  • Synthesis of findings to inform a molecular classification.

Main Results:

  • Lesions affecting the cochlear sensory system and synapse yield optimal CI outcomes.
  • Auditory nerve lesions negatively impact CI performance due to impaired neural signal transmission.
  • Genetic evaluation (synaptopathy vs. neuropathy) is crucial for predicting CI success.

Conclusions:

  • A molecular classification of ANSD based on lesion site is proposed.
  • This classification aids in preoperative counseling and outcome prediction for CI candidates.
  • Understanding genetic underpinnings of ANSD enhances CI efficacy for hearing loss.