Semimicroscopical observations on the crista stapedis

Area of Science:

• Anatomy
• Otolaryngology
• Human Morphology

Background:

• The stapes bone is a key ossicle in the middle ear, transmitting sound vibrations.
• Understanding the anatomical variations of the stapes is important for otologic surgery and understanding hearing mechanics.

Purpose of the Study:

• To compare the size and morphology of the stapes crista in adult and fetal human specimens.
• To document variations in the stapes crista and its relationship with the stapes base and pillar groove.

Main Methods:

• Human adult and fetal stapes were dissected and examined under a stereoscopic microscope.
• The presence, size, and morphology of the crista connecting the stapes crura to the base were analyzed.

Main Results:

• A crista structure was observed in 65% of the 110 stapes specimens examined; 35% lacked this structure.
• Cristae were classified as large, medium, or rudimentary, with variations including incomplete or irregular forms.
• The crista divides the stapes base into two fossae, with observed asymmetry and orifices in some specimens.

Conclusions:

• The stapes crista is a variable anatomical feature in humans, present in the majority of specimens.
• Variations in crista morphology may influence sound transmission and require consideration in otologic procedures.