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The zonular insertion: a scanning electron microscopic study

B W Streeten

    Investigative Ophthalmology & Visual Science
    |April 1, 1977
    PubMed
    Summary
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    Human lens capsule zonular insertion involves diverse fibrils. Meridional zonules distribute lateral pull, while surface ripples arise from differential fiber contraction, revealing intricate structural details.

    Area of Science:

    • Ophthalmology
    • Biomaterials Science
    • Cell Biology

    Background:

    • The human lens capsule's zonular insertion is crucial for maintaining lens position and focusing.
    • Previous studies have provided limited detailed structural information on this specific area.

    Purpose of the Study:

    • To investigate the ultrastructural morphology of the zonular insertion on the human lens capsule.
    • To characterize the different fibrillar components and their arrangement within the insertion zone.

    Main Methods:

    • Scanning electron microscopy (SEM) was employed to examine the fine structure of the zonular insertion.
    • High-resolution imaging allowed for detailed visualization of fibrillar components and their interactions.

    Main Results:

    Related Experiment Videos

    • The entire zonular insertion area is covered by 35-55 nm fibrils, including major inserting zonules, meridional zonules, and capsular surface fibrils.
    • A nonoriented fibrillar layer overlies the zonules, and meridional zonules spanning the equator likely distribute lateral pull from major zonules.
    • Surface rippling is attributed to differential contraction between oriented fibers, nonoriented fibrils, and the superficial capsule. Fibrils attach via embedding in a granular capsular matrix (0.5-1 µm thick).

    Conclusions:

    • The human lens capsule's zonular insertion exhibits a complex, multi-layered fibrillar architecture.
    • These structural findings contribute to understanding the biomechanical properties and stability of the human lens.
    • The study elucidates the specific roles of different fibrillar components in lens support and accommodation.