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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...
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...

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Related Experiment Video

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Techniques of Endoscopic Ossiculoplasty
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Published on: January 26, 2024

The ostrich middle ear for developing an ideal ossicular replacement prosthesis.

Irina Arechvo1, Thomas Zahnert, Matthias Bornitz

  • 1Department of Ear, Nose and Throat Diseases, Vilnius University Emergency Hospital, Siltnamiu 29, 04130, Vilnius, Lithuania. arechvo@gmail.com

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
|January 3, 2012
PubMed
Summary

The ostrich middle ear is a valid avian model for tympanoplasty research, showing superior sound conduction and unique ossicular mechanics compared to humans. Its design informs new ossicular replacement implants.

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Area of Science:

  • Otorhinolaryngology
  • Biomedical Engineering
  • Comparative Anatomy

Background:

  • Tympanoplasty research requires suitable animal models to understand middle ear mechanics.
  • The avian middle ear, particularly the ostrich, presents unique morphological and functional characteristics.
  • Investigating these characteristics can provide insights into human middle ear function and surgical interventions.

Purpose of the Study:

  • To evaluate the avian (ostrich) middle ear as a model for tympanoplasty mechanics research.
  • To analyze the morphological, acoustic, and quasi-static properties of the ostrich tympano-ossicular system.
  • To compare the sound conduction and mechanical behavior of the ostrich middle ear with the human middle ear.

Main Methods:

  • Histological examination of stained ostrich middle ear specimens using light microscopy.
  • Laser Doppler vibrometry to assess sound transfer function and quasi-static performance.
  • Comparative analysis of displacement amplitudes between intact and reconstructed human and ostrich middle ears.

Main Results:

  • The ostrich middle ear exhibits significantly more effective sound conduction than the human middle ear, especially at low frequencies (up to 35 dB difference).
  • A unique buckling movement of the extracolumella under pressure was identified as a protective mechanism.
  • Ostrich middle ear footplate displacements exceeded human footplate displacements in both intact and reconstructed ears.

Conclusions:

  • The ostrich middle ear is a suitable model for developing and testing total ossicular replacement implants.
  • The findings suggest that future ossicular prostheses should incorporate elastic elements to accommodate larger quasi-static eardrum movements.
  • Understanding the ostrich's unique biomechanics offers valuable data for advancing reconstructive middle ear surgery.