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Related Concept Videos

The Auditory Ossicles01:11

The Auditory Ossicles

The auditory ossicles of the middle ear transmit sounds from the air as vibrations to the fluid-filled cochlea. The auditory ossicles consist of two malleus (hammer) bones, two incus (anvil) bones, and two stapes (stirrups), one on each side. These bones develop during the fetal stage and are the ones to ossify first. They are fully mature at birth and do not grow afterward.
The aptly named stapes look very much like a stirrup. The three ossicles are unique to mammals, and each plays a role in...
The Cochlea01:13

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.
Anatomy of the Ear01:16

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 Balance01:15

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 Pathway01:15

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...
Auditory Perception01:17

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...

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Related Experiment Video

Updated: Jun 16, 2026

The Microscopic Transcanal Approach in Stapes Surgery Revisited
07:35

The Microscopic Transcanal Approach in Stapes Surgery Revisited

Published on: February 16, 2022

Complex stapes motions in human ears.

Jae Hoon Sim1, Michail Chatzimichalis, Michael Lauxmann

  • 1University Hospital Zurich, Zurich, Switzerland. JaeHoon.Sim@usz.ch

Journal of the Association for Research in Otolaryngology : JARO
|February 19, 2010
PubMed
Summary
This summary is machine-generated.

Complex stapes motion, including piston-like and rocking movements, was quantified in human ears. Rocking motions increased with frequency, highlighting a novel method for precise measurement and error analysis in auditory mechanics.

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The Microscopic Transcanal Approach in Stapes Surgery Revisited
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Area of Science:

  • Otoacoustic emissions
  • Auditory biomechanics
  • Human temporal bone research

Background:

  • Stapes motion is crucial for hearing, primarily piston-like at low frequencies and incorporating rocking at higher frequencies.
  • Accurate measurement of complex stapes motion is challenging due to sensitivity to device angulation and measurement errors.

Purpose of the Study:

  • To quantitatively assess complex stapes motions and their error boundaries.
  • To analyze the frequency-dependent contributions of piston-like and rocking motions of the stapes footplate.

Main Methods:

  • Utilized a Scanning Laser Doppler Vibrometer (SLDV) to measure velocity at multiple points on human temporal bone footplates.
  • Calculated piston-like and rocking motion components using micro-CT imaging for precise frame correlation.
  • Developed a novel method for quantitative assessment and error boundary determination.

Main Results:

  • The ratio of rocking to piston-like motion increased with frequency, peaking around 7 kHz.
  • Measured magnitudes of piston-like and rocking motions exceeded estimated upper error bounds across the 0.5–8 kHz range.
  • Presented a new methodology for robust stapes motion analysis.

Conclusions:

  • The study provides a validated method for accurately measuring complex stapes dynamics.
  • Findings reveal significant rocking motions at higher frequencies, crucial for understanding auditory transmission.
  • The developed technique offers improved precision and error assessment for auditory research.