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The human round window membrane. An electron microscopic study.

P A Schachern, M M Paparella, A J Duvall

    Archives of Otolaryngology (Chicago, Ill. : 1960)
    |January 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

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    The normal adult human round window membrane has three distinct layers. Researchers also identified and described "false" round window membranes with similar layered structures.

    Area of Science:

    • Otolaryngology
    • Anatomy
    • Histology

    Background:

    • The round window membrane is crucial for hearing.
    • Its detailed ultrastructure is not fully understood.
    • Understanding its layers is vital for middle ear surgery and treatments.

    Purpose of the Study:

    • To examine the ultrastructure of the normal adult human round window membrane.
    • To describe the layered composition of the round window membrane.
    • To differentiate it from "false" round window membranes.

    Main Methods:

    • Transmission electron microscopy was used.
    • The normal adult human round window membrane was analyzed.
    • Mucosal membrane veils forming "false" round window membranes were also examined.

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    Main Results:

    • The normal round window membrane consists of three layers: epithelial, fibrous, and mesothelial.
    • The fibrous layer contains collagen, elastin, fibrocytes, vessels, and nerves.
    • "False" round window membranes also exhibit three layers but differ in their innermost layer.

    Conclusions:

    • The normal round window membrane has a unique three-layered structure.
    • "False" round window membranes, while similar, have distinct ultrastructural differences.
    • These findings contribute to the understanding of middle ear anatomy and pathology.