SECTION IV. THE UROGENITAL ORGANS 



The urogenital system is a complex of two systems, the 

 excretory (nephric) system and the reproductive (genital) 

 system. The excretory system is composed of the excretory 

 glands or kidneys (mesonephroi in the frog), their ducts, 

 the ureters (mesonephric ducts in the frog), and a storage 

 sac, the excretory bladder. The reproductive system is 

 composed of the genital glands or gonads (ovaries or testes) , 

 and their gonoducts (mesonephric duct in the male, oviduct 

 in the female). Both open into the cloaca. 



Without cutting anything locate the following structures 

 in 



1. The Female Urogenital System 



Lift the ovary (39) on one side; notice that it is attached 

 to the body wall by 



81. the mesovarium, a thin sheet of peritoneum (32). 



82. The fat-body, a mass of yellow finger-like processes, 

 is attached to the cephalic end of the ovary. 



83. The kidneys (mesonephroi), a pair of red lobu- 

 lated glands, lie underneath the ovary and are at- 

 tached also to the fat-bodies. They are covered with 

 peritoneum which obscures them in the preserved 

 specimen, as they are extra-peritoneal. 



84. The ureter or mesonephric duct may be seen at the 

 lateral margin of each kidney by carefully removing 

 the peritoneum. It leads to the cloaca. 



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