212 



THE UROGENITAL SYSTEM 



Aorta 



Lung 



Diaphragm 



Ostium abdominale 



Miillerian duct 



Inferior vena caiia 



Genital gland , 

 Colon 



Allantois 



Pulmonary trunk 

 Pulmonary artery 



-^Esophagus 



Mesonephric dud, 

 Mesonephros 



Umbilical artery 



FIG. 223. Ventral dissection of an 18 mm. pig embryo, to show the anlages of the Mullerian 



ducts. X 7- 



Trachea 



Esophagus r- 



I 



Genital gland t=l 

 Mesonephric duct 



Allantois 



Lung 



Mesonephros 



Mullerian duct 



Colon 



Umbilical artery 



FIG. 224. Ventral dissection of a 24 mm. pig embryo, showing the anlages of the Mullerian 

 ducts at a later stage of development than in Fig. 223. X 6. 



