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A microanalytical study on human auditory ossicles in normal and pathological conditions.

J M Sánchez-Fernández1, S Saint-Gerons, A Sánchez del Rey

  • 1Department of Otolaryngology, School of Medicine, University of the Basque Country, Bilbao, Spain.

Acta Oto-Laryngologica
|January 1, 1992
PubMed
Summary

This study analyzed the calcium/phosphorus (Ca/P) ratio in human auditory ossicles during development and disease. Normal ossification shows distinct Ca/P ratios, with no significant changes found in pathological conditions.

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Area of Science:

  • Otoacoustic Emissions
  • Biomaterials Science
  • Human Anatomy

Background:

  • Auditory ossicles (malleus, incus, stapes) are crucial for hearing.
  • Their ossification process involves complex mineral deposition.
  • Understanding elemental composition aids in diagnosing hearing impairments.

Purpose of the Study:

  • To investigate the calcium/phosphorus (Ca/P) ratio and sulfur content in human auditory ossicles.
  • To analyze elemental changes during fetal and infant development.
  • To compare ossicle composition in normal and pathological conditions (cholesteatoma, otitis).

Main Methods:

  • Microanalytical study of human auditory ossicles from fetuses, infants, and adults.
  • Analysis of samples from patients with middle ear cholesteatoma, chronic otitis, and facial nerve schwannoma.

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  • Quantification of Ca/P ratio and sulfur levels using elemental analysis.

    • Main Results:

    • Ossification of malleus and incus begins in the fetal period, with Ca/P ratios reaching 1.8-1.9 by 29 weeks gestation.
    • Normal adult Ca/P ratios are approximately 2.10 for malleus and 2.19 for incus.
    • Mature Ca/P ratios in the stapes footplate (2.11) are observed by 23 weeks gestation, with slower development in other stapes parts.
    • An inverse relationship between Ca/P ratio and sulfur values was confirmed during ossification.
    • No significant alterations in Ca/P ratio or sulfur were found in the pathological samples studied.

    Conclusions:

    • Auditory ossicle ossification follows a distinct developmental trajectory with specific Ca/P ratios.
    • The observed elemental composition in pathological samples suggests ossification processes are not significantly altered.
    • This microanalytical data provides a baseline for understanding normal and potentially pathological ossicle development.