THE STUDY OF SIX AND TEN MILLIMETER PIG EMBRYOS 



Spinal ganglion 



Spinal nerve 



Spinal cord 



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 cord 



Spinal ganglion 



Descending aorta 

 Mesonephros 



R. lung bud'. 



Esophagus 



Lesser peritoneal s< 



Inferior vena cava 



Notochord 



Sympathetic ganglion 

 Post, cardinal vein 



Mesonephric tubule 



Peritoneal cavity 

 Dorsal lobe of liver 



Sinusoids of liver 



Ductus iienosus 



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. 



