1. The female urogenital sinus also gives rise to the urethra and vestibule of the vagina. 2. The anterior portion becomes the urogenital sinus . 3. The prostate forms from the urogenital sinus and the efferent ducts form from the mesonephric tubules. 4. The female reproductive system is composed of two embryological segments : the urogenital sinus and the paramesonephric ducts. 5. Females have an external clitoris and a urogenital sinus , which acts as both a urethra and vagina. 6. Embryologically, the bladder is derived from the urogenital sinus , and it is initially continuous with the allantois. 7. The urethra typically opens into a common channel with the vagina ( i . e . urogenital sinus ). 8. The remainder of this part of the urogenital sinus forms the body of the bladder and part of the prostatic urethra. 9. After the separation of the rectum from the dorsal part of the cloaca, the ventral part becomes the primary urogenital sinus . 10. The urogenital sinus , in turn, divides into the superficial definitive urogenital sinus and the deeper anterior vesico-urethral portion.
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