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Related Concept Videos

Anatomy of the Ear01:16

Anatomy of the Ear

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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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Related Experiment Video

Updated: Dec 30, 2025

In Vivo Morphometric Analysis of Human Cranial Nerves Using Magnetic Resonance Imaging in Menière's Disease Ears and Normal Hearing Ears
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Internal Auditory Canal Variability: Anatomic Variation Affects Cisternal Facial Nerve Visualization.

Michael A Cohen1, Hussam Abou-Al-Shaar1,2, Yair M Gozal1,3

  • 1Department of Neurosurgery, Clinical Neurosciences Center, University of Utah, Salt Lake City, Utah.

Operative Neurosurgery (Hagerstown, Md.)
|January 19, 2020
PubMed
Summary
This summary is machine-generated.

Internal auditory canal (IAC) anatomy varies significantly, impacting surgical exposure of facial and vestibulocochlear nerves. This variability particularly affects the translabyrinthine approach, highlighting the need for pre-operative assessment.

Keywords:
Internal auditory canalMeningiomaPosterior fossaRetrosigmoid approachTranslabyrinthine approachVestibular schwannoma

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Area of Science:

  • Neurosurgery
  • Radiology
  • Anatomy

Background:

  • The internal auditory canal (IAC) is a critical surgical landmark for cerebellopontine angle lesions.
  • Radiographic assessment reveals significant variability in IAC position and orientation.
  • Individual IAC anatomy influences surgical exposure during procedures.

Purpose of the Study:

  • To investigate how IAC position and orientation affect surgical exposure, particularly for the facial nerve.
  • To specifically evaluate the impact on the translabyrinthine surgical approach.

Main Methods:

  • Retrospective review of 50 MRI studies of patients with vestibular schwannomas.
  • Quantitative measurements of IAC position and orientation, including petrous distances and angles (APD, PPD, APA, PPA, IAA).

Main Results:

  • Demonstrated significant variability in IAC position and orientation within the petrous temporal bone.
  • Measurement ranges: APD (10.2–26.1 mm), PPD (15.1–37.2 mm), APA (104–157°), PPA (30–96°), IAA (-5–40°).

Conclusions:

  • IAC anatomical variability substantially impacts surgical exposure of the IAC and cranial nerves VII and VIII.
  • A horizontally oriented IAC with a small IAA can compromise facial nerve visualization during translabyrinthine approaches.
  • The retrosigmoid approach appears less affected by IAC positional and angular variations.