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Muscular development in the urinary tract.

T Matsuno, S Tokunaka, T Koyanagi

    The Journal of Urology
    |July 1, 1984
    PubMed
    Summary
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    This study details the histological development of fetal urinary tract muscles, revealing distinct timelines for ureteral, bladder, and urethral muscle differentiation crucial for urinary function.

    Area of Science:

    • Urology
    • Developmental Biology
    • Histology

    Background:

    • Understanding the precise timing of muscular development in the fetal urinary tract is essential for diagnosing congenital anomalies.
    • Previous research has provided fragmented information on the histological differentiation of these structures.

    Purpose of the Study:

    • To conduct a detailed histological investigation of the muscular development in the human ureter, ureterovesical junction, bladder, and sphincteric urethra.
    • To establish a timeline for the differentiation of various muscle components within these organs during fetal development.

    Main Methods:

    • Histological examination of 17 human fetuses (3-21 weeks gestation) and 2 neonates.
    • Focus on the muscular development and differentiation patterns.

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    Main Results:

    • Ureteral muscle differentiation begins at the 12th week, with spiral bundles in the upper ureter and longitudinal bundles forming at the 17th week.
    • Detrusor muscle differentiation starts at the 7th week in the bladder apex; urethral striated muscle appears at the 8th week, and smooth muscle between the 9th-11th weeks.
    • Periureteral sheaths and trigonal muscle show differentiation patterns closely following intramural ureteral muscle development.

    Conclusions:

    • The study provides a comprehensive timeline for the histological muscular differentiation of the fetal urinary tract.
    • These findings are critical for understanding normal development and identifying potential congenital abnormalities related to urinary tract musculature.