Scanning electron microscopic study of the human auditory ossicles.

Area of Science:

• Anatomy
• Histology
• Otolaryngology

Background:

• Auditory ossicles (malleus, incus, stapes) are crucial for hearing.
• Understanding their micro-architectural surface characteristics is vital for otologic research.

Purpose of the Study:

• To compare bone surface types and resorption patterns in human auditory ossicles.
• To investigate potential differences between sexes and correlations with age.

Main Methods:

• Scanning electron microscopy (SEM) was used to examine ossicles from 34 human cadavers.
• Quantitative analysis of bone surface types, including resting, bone-forming, and resorbing surfaces, was performed.

Main Results:

• The malleus exhibited predominantly stable, smooth fibrous surfaces with limited resorption.
• The incus and stapes, particularly the long process of the incus and the neck of the stapes, showed higher percentages of resorbing surfaces and vascular canal openings.
• Resorbing surface area correlated with vascular canal openings in these regions.

Conclusions:

• The malleus appears to be a stable bone, whereas the incus and stapes undergo significant bone remodeling.
• Bone erosion in the incus and stapes is likely related to regional vascularization.
• No significant sex-based or age-related differences were found in these resorption patterns.