THE CCELOM AND MESODERM 



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below by the pulmo-hepatic ligaments. On each side of the 

 dorsal mesentery therefore there is a recess, the pulmo-hepatic 

 recess, bounded on the median side by the dorsal mesentery 

 and stomach, laterally by the accessory mesentery and pulmo- 



Fig. 126. — Transverse section through the trunk of a bird showing the 

 relations of the ccelom. 

 as, air-sac ; os, oblique septum ; pc, pleural cavity ; v, vertebra ; other 

 letters as Fig. 125. 



hepatic ligament, and below by the liver. Owing to the 

 curvature of the stomach and the return of the anterior portion 

 of the intestine to form the loop of the duodenum, the pulmo- 

 hepatic recess of the right side comes to form a pocket, the 



T 



