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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...

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.

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 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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Related Experiment Video

Updated: May 29, 2026

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

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

Published on: August 18, 2023

Duplicate internal auditory canals with facial and vestibulocochlear nerve dysfunction.

T Y Kew¹, A Abdullah

¹Department of Radiology, Medical Faculty, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia. tykew@email.com

The Journal of Laryngology and Otology

|August 27, 2011

Summary

This study details a rare case of duplicated internal auditory canals presenting with facial and vestibulocochlear nerve dysfunction. The findings highlight the importance of advanced MRI for assessing neural integrity in such anatomical anomalies.

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In Vivo Morphometric Analysis of Human Cranial Nerves Using Magnetic Resonance Imaging in Menière's Disease Ears and Normal Hearing Ears

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Published on: February 21, 2018

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Last Updated: May 29, 2026

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

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In Vivo Morphometric Analysis of Human Cranial Nerves Using Magnetic Resonance Imaging in Menière's Disease Ears and Normal Hearing Ears

In Vivo Morphometric Analysis of Human Cranial Nerves Using Magnetic Resonance Imaging in Menière's Disease Ears and Normal Hearing Ears

Published on: February 21, 2018

Area of Science:

Neuroscience
Radiology
Otolaryngology

Background:

Duplication of the internal auditory canal (IAC) is an exceptionally rare congenital anomaly.
Associated cranial nerve deficits, particularly involving the facial (CN VII) and vestibulocochlear (CN VIII) nerves, are infrequently documented.

Observation:

A 34-year-old male presented with lifelong right-sided sensorineural hearing loss and facial nerve palsy (House-Brackmann grade III).
Imaging revealed ipsilateral duplicate, vacant internal auditory canals.
Radiological findings were interpreted as vestibulocochlear nerve aplasia and severe facial nerve hypoplasia.

Findings:

This case represents the first documented instance of vestibulocochlear nerve aplasia and severe facial nerve hypoplasia occurring with ipsilateral IAC duplication.
Literature review indicates variable, but often compromised, integrity of CN VII and CN VIII in cases of IAC duplication.

Implications:

High-resolution gradient echo MRI sequences are crucial for evaluating neural integrity in patients with abnormal IACs and associated cranial nerve dysfunction.
Accurate diagnosis impacts management strategies for hearing loss and facial paralysis in these rare conditions.