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Anatomy of the Ear01:16

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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

Updated: Apr 22, 2026

Enhancing Electrode Location Assessment in Cochlear Implantation via Computed Tomography Image Fusion
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Enhancing Electrode Location Assessment in Cochlear Implantation via Computed Tomography Image Fusion

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Method to estimate the complete and two-turn cochlear duct length.

George Alexiades1, Anandhan Dhanasingh, Claude Jolly

  • 1*Icahn School of Medicine at Mount Sinai, New York, New York, U.S.A.; and †MED-EL Corporation, Innsbruck, Austria.

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology
|October 10, 2014
PubMed
Summary

A single CT scan measurement can accurately estimate cochlear duct length (CDL) in human temporal bones. This method simplifies previous tedious measurements for potential use in cochlear implant electrode insertion.

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Area of Science:

  • Anatomy
  • Radiology
  • Otolaryngology

Background:

  • Cochlear duct length (CDL) is crucial for understanding cochlear anatomy.
  • Traditional methods for measuring CDL are time-consuming and complex.
  • Previous studies established ranges for the organ of Corti length (25-35 mm).

Purpose of the Study:

  • To develop a reliable method for estimating complete and two-turn cochlear duct length (CDL).
  • To utilize a single computed tomography (CT) image for CDL estimation.
  • To simplify the measurement of cochlear dimensions for clinical applications.

Main Methods:

  • Reviewed prior histological and radiographic CDL measurements.
  • Extrapolated CDL using Escudé's third equation as a basis.
  • Measured the diameter of the basal turn (A) from CT scans.

Main Results:

  • Derived equations to estimate two-turn CDL: 2TL(oc) = 3.65(A-1) and 2TL(i) = 3.65(A-0.7).
  • Derived equations for complete CDL estimation: CDL(oc) = 4.16A - 4 and CDL(i) = 4.16A - 2.7.
  • Demonstrated reliable estimation of CDL using a single linear measurement from CT images.

Conclusions:

  • A single linear CT measurement reliably estimates two-turn and complete CDLs in human temporal bones.
  • The two-turn CDL offers a balance between cochlear coverage and minimizing insertion trauma.
  • This CT-based method provides a practical approach for assessing cochlear dimensions.