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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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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.
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Related Experiment Video

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Discovering Middle Ear Anatomy by Transcanal Endoscopic Ear Surgery: A Dissection Manual
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Examination of inner ear structures: a micro-CT study.

Ferhat Geneci1, Muhammet Bora Uzuner2, Burak Bilecenoğlu3

  • 1Department of Anatomy, Faculty of Medicine, Ankara Yıldırım Beyazıt University, Ankara, Turkey.

Acta Oto-Laryngologica
|January 5, 2022
PubMed
Summary
This summary is machine-generated.

Microcomputed tomography (micro-CT) precisely measured inner ear anatomy, establishing normal ranges for the vestibule, lateral semicircular canal, and cochlea. These detailed anatomical data aid in understanding and treating inner ear pathologies.

Keywords:
Inner earcochlealateral semicircular canalmicrocomputed tomographyvestibular aqueductvestibule

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Area of Science:

  • Anatomy
  • Medical Imaging
  • Otology

Background:

  • Detailed investigation of inner ear anatomy using microcomputed tomography (micro-CT).
  • Contribution of precise anatomical data for understanding inner ear pathologies.
  • Potential clinical applications of high-resolution inner ear anatomical data.

Purpose of the Study:

  • To establish normal measurement ranges for the vestibular aqueduct (VA), vestibule, lateral semicircular canal, and cochlea.
  • Utilizing high-resolution micro-CT scanning of dry temporal bone samples.
  • Providing a precise anatomical database for clinical reference.

Main Methods:

  • Microcomputed tomography (micro-CT) was employed on 40 dry temporal bones.
  • Measurements were conducted on axial plane sections using specialized micro-CT software.
  • Focus on detailed anatomical analysis of key inner ear structures.

Main Results:

  • Median diameter of the operculum: 0.487 mm; vestibular aqueduct: 0.294 mm.
  • Median diameter of the lateral semicircular canal (nonampullated section): 1.103 mm.
  • Mean cochlear height: 3.417 mm; width: 5.615 mm. Mean vestibule length: 6.085 mm; width: 3.002 mm.

Conclusions:

  • A comprehensive database of normal anatomical values for the bony labyrinth has been created.
  • High-precision measurements provide a valuable resource for clinicians.
  • Facilitates further research and clinical considerations in treating inner ear diseases.