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The urinary and reproductive organs are developed from the intermediate mesoderm. These embryonic structures are on either side; the pronephros, the mesonephros and the metanephros of the kidney, and the Wolffian and Müllerian ducts of the sex organ.
In this way, how does urinary bladder develop?
The urinary bladder develops from the upper end of the urogenital sinus, which is continuous with the allantois and lined with endoderm. The lower ends of the metanephric ducts are incorporated into the wall of the urogenital sinus and form the trigone of the bladder.
Also, how does the urinary system create and release urine?
The kidneys filter the blood to remove wastes and produce urine. The ureters, urinary bladder, and urethra together form the urinary tract, which acts as a plumbing system to drain urine from the kidneys, store it, and then release it during urination.
The trigone (a.k.a. vesical trigone) is a smooth triangular region of the internal urinary bladder formed by the two ureteric orifices and the internal urethral orifice. The area is very sensitive to expansion and once stretched to a certain degree, the urinary bladder signals the brain of its need to empty.