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Ðề tài: Dị tật ống niệu rốn

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    Default Dị tật ống niệu rốn

    Chủ Đề: Default Dị tật ống niệu rốn

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    ►Ngày Gửi: 16-08-09 ►Đánh Giá: Sao

    The urachus is an embryological canal connecting the urinary bladder of the fetus with the allantois, a structure that contributes to the formation of the umbilical cord. The lumen (inside) of the urachus is normally obliterated during embryonic development, transforming the urachus into a solid cord, a functionless remnant. The urachus lies in the space of Retzius, between the transversalis fascia anteriorly and the peritoneum posteriorly.





    Formation
    The vesico-urethral portion of the urogenital sinus absorbs the ends of the Wolffian ducts and the associated ends of the renal diverticula, and these give rise to the trigone of the bladder and part of the prostatic urethra. The remainder of the vesico-urethral portion forms the body of the bladder and part of the prostatic urethra; its apex is prolonged to the umbilicus as a narrow canal, which later is obliterated and becomes the median umbilical ligament (urachus). Note: The two medial umbilical ligaments are the obliterated umbilical arteries.


    Pathology
    Failure for the lumen of the urachus to be filled in leaves a patent (open) urachus. The telltale sign is leakage of urine through the umbilicus. A patent urachus needs to be surgically removed. There are four anatomical cases

    1. Urachal cyst: there is no connection between the bladder and the umbilicus
    2. Urachal fistula: there is free communication between the bladder and umbilicus
    3. Urachal diverticulum: the pouch opens toward the bladder
    4. Urachal sinus: the pouch opens toward the umbilicus
    Tương lai tươi sáng thường dựa trên quá khứ đã quên lãng, bạn không thể sống thanh thản nếu bạn không vứt bỏ mọi nỗi buồn đã qua.

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    1.Urachal cyst
    Such cyst is found somewhere along the allantois canal.
    The cyst has a small connection to the bladder and can become infected, leading to its diagnosis.



    1. Bladder
    2. Urethra
    3. Urachus(fibrous relict of the allantois)
    4. Navel
    5. Umbilical cyst
    6. Urachal cysts


    2.Urachal fistula:
    In a urachal fistula a lumen remains over the whole length of the urachus because the atrophy of the allantois fails to take place. The urine flows from the bladder directly through the navel onto the skin.


    1.Bladder
    2.Urethra
    4.Navel
    7.Outflow of the urine onto the skin
    10.Uninterrupted urachal fistula

    3.Urachal diverticulum(Internal fistula)
    It is a diverticulum in the upper part of the bladder.

    4.Urachal sinus(External fistula)
    It is a blind terminating sac that emerges from the navel


    1.Bladder
    2.Urethra
    3.Urachus (fibrous relict of the allantois)
    4.Navel
    7.Urine outflow onto the skin
    8.External fistula (urachal sinus)
    9.Internal fistula (urachus diverticulum)

    from:www.embryology.ch/.../patholurinary07.html
    Tương lai tươi sáng thường dựa trên quá khứ đã quên lãng, bạn không thể sống thanh thản nếu bạn không vứt bỏ mọi nỗi buồn đã qua.

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