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The urachus forms from the distal end of the allantois in the embryo, and develops into a closed cord between the base of the bladder, and the navel. [1] It drains the bladder of the fetus that joins and runs within the umbilical cord . [ 2 ]
4. Urinary bladder. 5. Urachus. cl. Cloaca. cp. Elevation which becomes clitoris or penis. i. Lower part of the intestine. ls. Fold of integument from which the labia majora or scrotum are formed. m, m. Right and left Müllerian ducts uniting together and running with the Wolffian ducts in gc, the genital cord. ot.
If the urachus fails to close during fetal life, it can result in anatomical abnormalities such as a urachal cyst, urachal fistula, urachal diverticulum or urachal sinus. In very rare cases the urachus can fail to close fully. This can lead to a condition known as a patent urachus (also urachal fistula). Although it is mainly immediately ...
4. Urinary bladder. 5. Urachus. cl. Cloaca. cp. Elevation which becomes clitoris or penis. i. Lower part of the intestine. ls. Fold of integument from which the labia majora or scrotum are formed. m, m. Right and left Müllerian ducts uniting together and running with the Wolffian ducts in gc, the genital cord. ot.
During fetal development, the allantois becomes the urachus, a duct between the bladder and the yolk sac. A patent allantois can result in a urachal cyst. Because the allantois can be cultured ex vivo, it has utility as a model system for studying the formation of blood vessels as well as considerable usefulness in drug screening.
Surrounding the umbilical collar is the periumbilical skin. Directly behind the navel is a thick fibrous cord formed from the umbilical cord, called the urachus, which originates from the bladder. [5] The belly button is unique to each individual due to it being a scar, and various general forms have been classified by medical practitioners.
A urachal cyst is a sinus remaining from the allantois during embryogenesis.It is a cyst which occurs in the remnants between the umbilicus and bladder. [1] This is a type of cyst occurring in a persistent portion of the urachus, presenting as an extraperitoneal mass in the umbilical region.
The fetal membranes separate maternal tissue from fetal tissue at a basic mechanical level. The fetal membrane is composed of a thick cellular chorion covering a thin amnion composed of dense collagen fibrils. The amnion is in contact with the amniotic fluid and ensures structural integrity of the sac due to its mechanical strength.