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Related Concept Videos

Anatomy of the Ear01:16

Anatomy of the Ear

7.2K
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...
7.2K
The Cochlea01:13

The Cochlea

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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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Auditory Pathway01:15

Auditory Pathway

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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.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking...
4.8K
Auditory Perception01:17

Auditory Perception

317
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...
317
Hair Cells01:22

Hair Cells

40.1K
Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here.
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Cochlear size variation in a large-scale international multicentre cohort.

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Various Surgical Techniques for Cochlear Implantation in an Ossified Cochlea: A Systematic Review.

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Sporadic Mixed Heterotopic Tissue Choristoma of the Middle Ear in an Adolescent Female: A Rare Case Report.

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Surgical Approaches and Complications in OSIA: a Systematic Review.

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Trans-impedance matrix heatmap patterns in cochlear implant patients with different cochlear pathologies: meningitis, otosclerosis, and temporal bone fractures.

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Related Experiment Video

Updated: Jun 6, 2025

Extracting the Cochlea from a Human Temporal Bone: A Cadaveric Protocol
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Extracting the Cochlea from a Human Temporal Bone: A Cadaveric Protocol

Published on: August 18, 2023

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Cochlear nerve visualization in Normal anatomy and inner ear malformations.

Majed Assiri1, Tawfiq Khurayzi2, Fida Almuhawas3

  • 1Abha Pediatric Hospital, Cochlear Implant Centre Ministry of Health Abha Saudi Arabia.

Laryngoscope Investigative Otolaryngology
|November 29, 2024
PubMed
Summary
This summary is machine-generated.

Magnetic resonance imaging (MRI) effectively visualizes the cochlear nerve (CN) in most inner ear anatomies, including malformations. This imaging is crucial for pre-operative assessment before cochlear implant (CI) surgery.

Keywords:
MRIcochleacochlear implantcochlear nerveinner ear

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Area of Science:

  • Neuroimaging
  • Otolaryngology
  • Anatomy

Background:

  • Inner ear anomalies can complicate surgical planning for cochlear implants (CIs).
  • Accurate visualization of neural structures is essential for successful CI outcomes.

Purpose of the Study:

  • To qualitatively assess variations in nerve bundles in normal versus anomalous inner ear anatomy.
  • To evaluate the utility of MRI in visualizing the cochlear nerve (CN) in diverse inner ear conditions.

Main Methods:

  • Retrospective review of 3.0-Tesla MRI scans of temporal bones from 49 ears.
  • Analysis using 3D slicer software to visualize nerve bundles within the internal auditory canal.
  • Comparison of nerve visibility between normal and malformed inner ear anatomies.

Main Results:

  • The cochlear nerve (CN) was visualized in all 20 normal inner ears.
  • CN visualization was achieved in 18 of 29 ears with inner ear malformations.
  • Even in common cavity malformations, a common nerve bundle was identifiable.

Conclusions:

  • MRI is highly effective for visualizing the cochlear nerve across various inner ear anatomies, including malformations.
  • Pre-operative MRI assessment of the CN is strongly recommended before cochlear implant surgery.