Urinary bladder
 


Kidney development video   -Interactive video text

The urinary bladder develops from the urogenital sinus. This sinus is connected to the umbilicus via the urachus. As the development of the sinus continues, the urinary bladder is formed anteriorly and the urogenital sinus is left posteriorly. Initially the urogenital sinus and the hindgut are derived from a common sac known as the cloaca.

The urogenital sinus continues its development and assists in the formation of the reproductive tract. The urinary bladder becomes separated from the urogenital sinus. The cloaca is an endodermal structure hence the bladder is also endodermal being derived from it. The bladder is connected to the umbilicus via the urachus, the median umbilical ligament. The urachus is patent, 1/3rd of its length from the bladder. It may finally develop into cysts, sinus or fistula if it does not completely disappear which may then connect the umbilicus with the urinary bladder.

The ureters are connected to the bladder at the lateral angles of the trigone while the Wolffian duct become connected to or maintain their connection to the urogenital sinus at its junction with the urinary bladder. The bladder mucosa may sometimes be found in the inferior umbilical abdominal wall where it is called ectopia vesicae.

 


 

  

  

Oluwole Ogunranti 

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