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Related Experiment Video

Updated: Jun 10, 2026

Extracting the Cochlea from a Human Temporal Bone: A Cadaveric Protocol
06:42

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

Published on: August 18, 2023

Posterior semicircular canal dehiscence: a histopathologic human temporal bone study.

Shigenobu Nomiya1, Sebahattin Cureoglu, Shin Kariya

  • 1Department of Otolaryngology, University of Minnesota, Minneapolis, Minnesota 55455, U.S.A.

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology
|July 27, 2010
PubMed
Summary

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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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Posterior semicircular canal dehiscence, a cause of ear symptoms, was found in 0.2% of adult temporal bones. Thin bone or dehiscence alone did not cause symptoms, suggesting other factors are involved.

Area of Science:

  • Otolaryngology
  • Neuroscience
  • Anatomy

Background:

  • Posterior semicircular canal dehiscence is associated with various ear symptoms.
  • Understanding the anatomical variations is crucial for diagnosing and managing these conditions.

Purpose of the Study:

  • To determine the incidence of posterior semicircular canal dehiscence.
  • To evaluate thin bone overlying the posterior semicircular canal.
  • To assess the development of the distance between the posterior semicircular canal and the posterior cranial fossa.

Main Methods:

  • Histopathological analysis of 1,051 adult human temporal bones.
  • Measurement of the shortest distance between the posterior semicircular canal and posterior cranial fossa.
  • Evaluation of fetal and pediatric temporal bones for developmental insights.

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Last Updated: Jun 10, 2026

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Main Results:

  • A distance less than 0.1 mm was observed in 2.2% of adult temporal bones.
  • True posterior semicircular canal dehiscence was found in 0.2% of specimens.
  • No clinical symptoms were confirmed in cases with thin bone or dehiscence; distance increased with age in children.

Conclusions:

  • Histopathological incidence of posterior semicircular canal dehiscence is lower than previously reported radiographically.
  • Posterior semicircular canal dehiscence may stem from developmental anomalies.
  • Factors beyond bone thinning are likely necessary for the clinical manifestation of canal dehiscence syndrome.