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Anatomy of the Ear

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

Updated: Oct 22, 2025

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

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

Published on: August 18, 2023

CT imaging-based approaches to cochlear duct length estimation-a human temporal bone study.

Tabita Breitsprecher¹, Anandhan Dhanasingh², Marko Schulze³

¹Department of Otorhinolaryngology, Head and Neck Surgery "Otto Körner", Rostock University Medical Center, Doberaner Strasse 137-139, D-18057, Rostock, Germany.

European Radiology

|August 31, 2021

Summary

This summary is machine-generated.

Accurate cochlear duct length (CDL) measurement is crucial for cochlear implantation (CI) electrode selection. The otosurgical planning software method using HRCT or CBCT provides the most reliable CDL estimation for predicting electrode depth.

Keywords:

Acoustic stimulation Cochlea Electrodes, implanted Imaging, three-dimensional

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Last Updated: Oct 22, 2025

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Area of Science:

Otolaryngology
Medical Imaging
Biomedical Engineering

Background:

Cochlear duct length (CDL) is vital for selecting appropriate cochlear implantation (CI) electrodes.
Current methods for estimating CDL lack a clinical gold standard, potentially leading to suboptimal electrode choices.

Purpose of the Study:

To identify the most reliable radiological imaging method and software for measuring CDL from routine clinical imaging.
To accurately predict the insertion depth of CI electrodes based on CDL measurements.

Main Methods:

Twenty human temporal bones were imaged using high-resolution computed tomography (HRCT) and cone beam computed tomography (CBCT).
CDL was measured using 3D reconstruction software, the A-value method, and an otosurgical planning software.
Measurements were compared against a reference standard (CDL_reference) derived from radiographs.

Main Results:

All tested methods, including HRCT and CBCT, tended to underestimate CDL.
The otosurgical planning software method showed the strongest correlation with the reference standard (r = 0.87 for HRCT, r = 0.76 for CBCT).
Excellent inter-rater reliability was observed for the otosurgical planning software methods and the reference standard (ICC = 0.94).

Conclusions:

Clinical imaging methods, including HRCT and CBCT, underestimate cochlear duct length.
An additional 10% of CDL should be considered in calculations to accurately predict postoperative CI electrode position.
The otosurgical planning software-based method is recommended for estimating CDL due to its accuracy and excellent inter-rater reliability.