SPLANCHiSrOLOGY 



163 



some of the larger bronchi. The esophagus is located above the 

 heart. Showing the relations of the visceral organs back of the 

 heart girdle, photograph number 44, gives an anterior section made 

 at 12, Fig. 33. The lungs are spread out occupying the posterior 

 thoracic region and below at No. 10 is the diaphragm. The dia- 

 phragm does not appear to have that rigidity and firmness of position 



Fig. 45. — Transverse section through the body of a hen at 10, Pig. 33. jR, 

 Right side. L, Left side, i, Spinal cord. 2, Body of vertebra. 3, Lungs, 

 4, Ova. 5, Proventriculus. 6, Liver. 7, Sternum. 8, Skin. 9, Pectoral 

 muscles. 



as in mammals. It is rather rudimentary. Below the left lung and 

 above the left lobe of the hver is the proventriculus. Note that 

 the viscus is empty and that the mucous membrane is thrown into 

 folds. At this point the liver occupies much of the abdominal 

 cavity. Figure 45 is a view of an anterior section made at 10, 



