Bladder And Urethra

During the fourth to seventh weeks of development the cloaca divides into the urogenital sinus anteriorly and the anal canal posteriorly (Fig. 14.12)

Mesonephric

Mesonephric

Divisions The Urogenital Sinus

Figure 14.12 Divisions of the cloaca into the urogenital sinus and anorectal canal. The mesonephric duct is gradually absorbed into the wall of the urogenital sinus, and the ureters enter separately. A. At the end of the fifth week. B. 7 weeks. C. 8 weeks.

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