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Figure 14.13 A. Development of the urogenital sinus into the urinary bladder and definitive urogenital sinus. B. In the male the definitive urogenital sinus develops into the penile urethra. The prostate gland is formed by buds from the urethra, and seminal vesicles are formed by budding from the ductus deferens.

Figure 14.14 Dorsal views of the bladder showing the relation of the ureters and mesonephric ducts during development. Initially the ureters are formed by an outgrowth of the mesonephric duct (A), but with time they assume a separate entrance into the urinary bladder (B-D). Note the trigone of the bladder formed by incorporation of the mesonephric ducts (C and D).

Figure 14.14 Dorsal views of the bladder showing the relation of the ureters and mesonephric ducts during development. Initially the ureters are formed by an outgrowth of the mesonephric duct (A), but with time they assume a separate entrance into the urinary bladder (B-D). Note the trigone of the bladder formed by incorporation of the mesonephric ducts (C and D).

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