486 Mr. C. B. Lockwood. Arteries of the Abdomen 



DlAGEAM 6. 



The letters are the same as before. The fossa between the omentum and transverse 



mesocolon is shallower. 



nowhere else ? Or why, before Haller invented his theory, was the 

 mesocolon always thought to have two layers ? The examination of a 

 large number of embryos shows that adhesion never takes place, but 

 that quite a different event happens. Suppose the loop of peritoneum 

 between the under surface of the omentum and the upper surface of 

 the transverse mesocolon was drawn out (see Diagrams 6, 7, and 8,/), 

 it would cause the colon to lie between the innermost layer of the 

 omental loop and the inferior layer of the mesocolon ; in other words, 



D I AGS AM 7. 



Letters as before. The pancreas is quite behind the peritoneum, the fossa between 

 the mesogastrium and mesocolon having nearly disappeared. 



