Morphological Variations of Middle Ear Ossicles and its Clinical Implications

Area of Science:

• Anatomy
• Otolaryngology
• Surgical Anatomy

Background:

• The middle ear ossicles (malleus, incus, stapes) are crucial for sound conduction and amplification.
• Existing research on middle ear ossicle morphology is limited for Indian populations.

Purpose of the Study:

• To investigate and document the morphological variations of the middle ear ossicles.
• To compare findings with existing global and Indian data.

Main Methods:

• Bilateral dissection of temporal bones from 26 cadavers using an operating microscope.
• Detailed morphological analysis of malleus, incus, and stapes.
• Evaluation of potential clinical implications of observed variations.

Main Results:

• The stapes exhibited the highest degree of morphological variability.
• The incus was identified as the most morphologically stable ossicle.
• The malleus showed variations in its manubrium, lateral, and anterior processes; stapes variations lacked a consistent pattern.

Conclusions:

• The stapes is the most variable middle ear ossicle, followed by the malleus, with the incus being the most stable.
• Findings contribute to understanding Indian middle ear ossicle morphology.
• Encourages further temporal bone dissection for ossicular banking for homografts in ossiculoplasty, offering an alternative to prostheses.