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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.

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...

Hair Cells

Hair Cells

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.

Hearing

Hearing

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.

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...

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Related Experiment Video

Updated: Mar 28, 2026

A Lightweight, Headphones-based System for Manipulating Auditory Feedback in Songbirds

A Lightweight, Headphones-based System for Manipulating Auditory Feedback in Songbirds

Published on: November 26, 2012

Directional hearing in insects with internally coupled ears.

Heiner Römer¹, Arne K D Schmidt²

¹Institute of Zoology, University of Graz, Universitaetsplatz 2, Graz, Austria. heinrich.roemer@uni-graz.at.

Biological Cybernetics

|December 24, 2015

Summary

Insects achieve precise directional hearing despite small body size using internally coupled ears. This sophisticated auditory system allows them to pinpoint sound sources with remarkable accuracy.

Keywords:

Acoustic trachea Crickets Evolution Interaural intensity difference Sound localization

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Last Updated: Mar 28, 2026

A Lightweight, Headphones-based System for Manipulating Auditory Feedback in Songbirds

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Selective Tracing of Auditory Fibers in the Avian Embryonic Vestibulocochlear Nerve

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In Ovo and Ex Ovo Methods to Study Avian Inner Ear Development

In Ovo and Ex Ovo Methods to Study Avian Inner Ear Development

Published on: June 16, 2022

Area of Science:

Bioacoustics
Insect Auditory Systems
Sensory Neuroscience

Background:

Insects possess diverse ear placements (wings, legs, thorax, abdomen) and small interaural distances, posing challenges for directional hearing cues like interaural time and intensity differences (ITDs and IIDs).
Small body size typically limits the precision of sound localization in animals.

Purpose of the Study:

To investigate the anatomy and function of internally coupled ears in insects for precise sound source localization.
To explore how insects overcome physical constraints to achieve hyperacute directional hearing.

Main Methods:

Comparative anatomical analysis of insect auditory systems.
Behavioral experiments assessing sound source localization precision in various insect species.
Examination of the biomechanics of internally coupled ears, focusing on cricket auditory systems.

Main Results:

Some insect species exhibit hyperacute directional hearing, localizing sound sources deviating from the midline by as little as [Formula: see text]-[Formula: see text].
Internally coupled ears, where sound pressure acts on both sides of the tympanic membrane, are crucial for this precise localization.
Crickets possess highly sophisticated internally coupled ears, representing an advanced auditory mechanism in the animal kingdom.

Conclusions:

Insect auditory systems, particularly internally coupled ears, demonstrate remarkable adaptations for precise sound localization despite physical limitations.
The study highlights the sophisticated sensory capabilities of insects, challenging assumptions about the constraints imposed by small body size on auditory perception.