THE GENITAL GLANDS AND DUCTS — INDIFFERENT STAGE 



211 



Aorta 



Liing—^ 



Diaphragm -[ 

 Ostium abdoviiiiale 

 Miillerian duct 



Inferior vena cava 



Genital gland — \ 

 Colon 



AUanlois 



Pulmonary trunk 

 Pulmonary artery 



Esophagus 



Mesonephric duct 

 Mesonephros 



Umbilical artery 



Fig. 223. — Ventral dissection of an 18 mm. pig embryo to show the anlages of the MuUerian ducts. X 7. 



/« 



y-- ■' r,-; 



/ .-. V-* 



Trachea 



Mesonephric duct 



Lung 



Mesonephros 



Miillerian duct 



Colon 



Umbilical artery 



Fig. 224.— Ventral dissection of a 24 mm. pig embryo showing the anlages of the Miillerian ducts at a 

 later stage of development than in Fig. 223. X 6. 



