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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...

Equilibrium and Balance

Equilibrium and Balance

The inner ear assumes dual functionalities of auditory perception and equilibrium maintenance. The vestibule is the organ responsible for balance. This organ contains mechanoreceptors, specifically hair cells, endowed with stereocilia, which aid in deciphering information regarding the position and motion of our heads. Two intrinsic components, the utricle and saccule, help perceive head position, while the semicircular canals track head movement. Neurological messages initiated in the...

Auditory Perception

Auditory Perception

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 cochlea, a...

The Vestibular System

The Vestibular System

The vestibular system is a set of inner ear structures that provide a sense of balance and spatial orientation. This system is comprised of structures within the labyrinth of the inner ear, including the cochlea and two otolith organs—the utricle and saccule. The labyrinth also contains three semicircular canals—superior, posterior, and horizontal—that are oriented on different planes.

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.

Auditory Pathway

Auditory Pathway

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 the...

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Updated: May 19, 2026

Endolymphatic Duct Blockage as a Surgical Treatment Option for Ménière's Disease

Endolymphatic Duct Blockage as a Surgical Treatment Option for Ménière's Disease

Published on: April 28, 2023

Eustachian tube function in patients with inner ear disorders.

Jonas J-H Park¹, Inger Luedeke, Kerstin Luecke

¹Department of Otorhinolaryngology and Head and Neck Surgery, RWTH Aachen University, Pauwelsstrasse 30, 52074 Aachen, Germany. jpark@ukaachen.de

European Archives of Oto-Rhino-Laryngology : Official Journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : Affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery

|September 4, 2012

Summary

Eustachian tube (ET) dysfunction may impact Meniere's disease. Direct sonotubometry revealed mild ET dysfunction in Meniere's patients, suggesting a link between ET function and inner ear pressure.

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Area of Science:

Otolaryngology
Audiology
Physiology

Background:

Eustachian tube (ET) dysfunction's role in Meniere's disease is debated.
Previous studies indirectly assessed ET function using tympanometry.
Direct assessment of ET function in inner ear disorders is needed.

Purpose of the Study:

To directly evaluate Eustachian tube (ET) function in patients with Meniere's disease and other inner ear disorders.
To compare ET function between healthy subjects and patients with specific otological conditions.

Main Methods:

Sonotubometry was used for direct ET function assessment.
Participants included healthy subjects and patients with Meniere's disease, sudden sensorineural hearing loss, cholesteatoma, and chronic suppurative otitis media.
Analysis focused on sound pressure intensity increase and duration during various ET opening maneuvers.

Main Results:

Healthy subjects exhibited the highest sound pressure intensity increase.
Significantly decreased ET function was observed in patients with cholesteatoma and Meniere's disease (p < 0.003).
Impaired ET function was noted in pathological ears during yawning, swallowing, Toynbee maneuver, and drinking.

Conclusions:

Sonotubometry provides direct assessment of ET function.
Mild ET dysfunction is detectable in Meniere's disease patients.
Findings suggest a link between ET dysfunction and inner ear conditions like Meniere's disease.