134 



THE STUDY OF SIX AND TEN MILLIMETER PIG EMBRYOS 



inal cord 



Spinal ganglion 

 Spinal nerve 



Post, cardinal vein 

 Mesonephros 



Pleural cavity 

 Upper limb bud 



Liver 



Notochord 



Dorsal aorta 

 Esophagus 



Bifurcation of trachea 

 Inferior vena cava 



FIG. 136. Transverse section through the liver and upper limb buds of a 10 mm. pig embryo, 

 at the level of the bifurcation of the trachea. X 22.5. 



/ 





Spinal ganglL 



Descending aorta 

 Mesonephros 



inal cord 



Notochord 



Sympathetic ganglion 

 . cardinal vein 



Post. 



R. lung bud 



Esophagus 



Lesser peritoneal sac 



Inferior vena cava 



Mesonephric tubule 



'eritoneal cavity 

 'Dorsal lobe of liver 



Sinusoids of liver 



Ductus venosus 



FIG. 137. Dorsal half of a transverse section through the lung buds, cranial to the stomach, in 

 a 10 mm. pig embryo. X 22.5. 



