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Anatomy of the Ear

Anatomy of the Ear

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...

The Cochlea

The Cochlea

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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Related Experiment Video

Updated: May 11, 2026

Intrathecal Application of a Fluorescent Dye for the Identification of Cerebrospinal Fluid Leaks in Cochlear Malformation

Intrathecal Application of a Fluorescent Dye for the Identification of Cerebrospinal Fluid Leaks in Cochlear Malformation

Published on: February 29, 2020

Cochlear-facial dehiscence--a newly described entity.

Danielle M Blake, Senja Tomovic, Alejandro Vazquez

The Laryngoscope

|May 29, 2013

Summary

Cochlear-facial dehiscence, a rare condition where bone separates the facial nerve and cochlea, causes hearing loss and tinnitus. This finding is crucial when other causes of third-window lesions are ruled out by CT scans.

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Cochlear Surface Preparation in the Adult Mouse

Cochlear Surface Preparation in the Adult Mouse

Published on: November 6, 2019

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Last Updated: May 11, 2026

Intrathecal Application of a Fluorescent Dye for the Identification of Cerebrospinal Fluid Leaks in Cochlear Malformation

Intrathecal Application of a Fluorescent Dye for the Identification of Cerebrospinal Fluid Leaks in Cochlear Malformation

Published on: February 29, 2020

Cochlear Surface Preparation in the Adult Mouse

Cochlear Surface Preparation in the Adult Mouse

Published on: November 6, 2019

Area of Science:

Otolaryngology
Neurosurgery
Radiology

Background:

Otic capsule dehiscence is a recognized pathological entity affecting the inner ear.
Symptoms like hearing loss, autophony, pulsatile tinnitus, and vertigo can indicate inner ear pathology.

Observation:

Two novel cases of cochlear-facial dehiscence are presented.
Computed tomography (CT) revealed bony dehiscence between the facial nerve and cochlea in both patients.

Findings:

Cochlear-facial dehiscence presents as a specific type of otic capsule dehiscence.
This condition can manifest as a "third-window lesion," causing characteristic auditory and vestibular symptoms.

Implications:

Cochlear-facial dehiscence should be considered in the differential diagnosis of third-window lesions.
When superior canal dehiscence is absent on CT, clinicians should evaluate for cochlear-facial dehiscence in patients with suggestive symptoms.