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[Ultrastructural study of the human bladder trigone].

A Lellouch-Tubiana, M T Simon, A Pfister

    Bulletin De L'Association Des Anatomistes
    |June 1, 1986
    PubMed
    Summary

    The trigonal epithelium in young females is stratified squamous nonkeratinizing, featuring Langerhans cells and estrogen sensitivity due to shared embryological origins with the vagina. This understanding aids in practical applications like the urocytogram.

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    Area of Science:

    • Urogynecology
    • Cell Biology
    • Histology

    Context:

    • The trigonal epithelium, a specialized tissue in the urinary bladder, shares embryological origins with the vagina.
    • Understanding its ultrastructure is crucial for diagnosing and managing various gynecological and urological conditions.

    Purpose:

    • To investigate the ultrastructural characteristics of the trigonal epithelium in young, healthy human females using transmission electron microscopy.
    • To correlate the observed ultrastructure with the known embryological origins and hormonal responses of this tissue.

    Summary:

    • Transmission electron microscopy revealed the trigonal epithelium to be stratified squamous nonkeratinizing, comprising approximately twenty cell layers.
    • Langerhans cells with Birbeck granules were identified in the basal and intermediate layers.
    • Distended intercellular spaces, particularly between junctional desmosomes, were noted, similar to urothelium.

    Impact:

    • The findings support the shared embryological origin of the trigone and vagina, explaining the trigonal epithelium's responsiveness to estrogens.
    • This research provides a foundation for understanding estrogen-mediated changes in the urinary tract and informs the practical application of urocytograms for assessing hormonal status.

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