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Updated: Aug 19, 2026
Undecalcified Bone Preparation for Histology, Histomorphometry and Fluorochrome Analysis
Published on: January 8, 2010
Demonstration of intravital microfissures in undecalcified plastic-embedded temporal bones with the prestaining
T Frisch1, M S Sørensen, P Bretlau
1Department of Otolaryngology-Head and Neck Surgery, Rigshospitalet, Copenhagen, Denmark.
Abstract:
Microfissures in the human otic capsule have been observed since the start of the century, but it was Otto Mayer, in 1930, who first realized that some of them were of intravital origin and not just processing artifacts. Since then, a small number of publications, based on decalcified temporal bones, have mostly confirmed his findings. With the introduction by Frost in the late 1950s of the undecalcified bone technique and the bulk staining technique for peripheral bones, a method was developed and refined for identifying even very small intravital microfissures (microdamage). Bulk staining of undecalcified otic capsules has not yet been used to verify the findings from the previous decalcified specimens. The present report presents our experience with the pertinent techniques, and suggests modifications and shortcuts pertinent to temporal bone research. Both large and tiny microfissures of intravital genesis are demonstrable within bulk-stained undecalcified human otic capsules. The importance of microfissures in the petrous bone in the causation of otosclerosis and perilymphatic leakage has long been discussed, and the present techniques may advance our understanding of these pathological conditions
Insights
This study demonstrates that bulk staining of undecalcified human otic capsules can reveal intravital microfissures. These findings may improve understanding of otosclerosis and perilymphatic leakage.
Area of Science:
- Otolaryngology
- Histopathology
- Skeletal Biology
Background:
- Intravital microfissures in the human otic capsule were first identified by Otto Mayer in 1930.
- Previous studies relied on decalcified temporal bones, potentially missing subtle microdamage.
- Advancements in undecalcified bone and bulk staining techniques offer improved visualization of microfissures.
Purpose of the Study:
- To evaluate the utility of bulk staining on undecalcified human otic capsules for identifying intravital microfissures.
- To present experience with and suggest modifications for temporal bone research techniques.
- To explore the potential of these techniques in understanding otosclerosis and perilymphatic leakage.
Main Methods:
- Utilized undecalcified bone techniques and bulk staining on human otic capsules.
- Applied refined methods for identifying even very small intravital microfissures (microdamage).
- Compared findings with previous studies based on decalcified temporal bones.
Main Results:
- Demonstrated both large and tiny microfissures of intravital genesis within bulk-stained undecalcified human otic capsules.
- Confirmed the presence of microfissures using a technique not previously applied to otic capsules.
- Techniques were refined with suggested modifications for temporal bone research.
Conclusions:
- Bulk staining of undecalcified human otic capsules effectively visualizes intravital microfissures.
- These advanced histological techniques may enhance the understanding of microfissure-related pathologies like otosclerosis and perilymphatic leakage.
- The study provides practical insights and methodological improvements for temporal bone research.
