1752 



HUMAN ANATOMY 



attachment of this mesentery was exceedingly short, merely broad enough to contain 

 the superior mesenteric artery. The so-called permanent viesentery is caused by the 

 falUng over to the right of the fold of mesentery for the ascending colon, twisting the 

 membrane, and the downward growth of that part of the gut which brings the 

 caecum down from under the liver to the right iliac fossa. The twist having occurred, 

 and the ascending colon having fallen against the abdominal wall, the fold bearing 

 the ascending and transverse colon becomes fused with the peritoneum of the pos- 

 terior right abdominal wall on the right of a line from the beginning of the jejunum 



Fig. 1477. 



Right supra- 

 renal body 



Vena cava 

 Portal vein 



Duodenum 



Right kidney 



Transverse 

 mesocolon 

 (cut) 



Beginning of 

 transverse 

 colon 



Mesentery of. 

 jejuno-ileum 

 (cut) 



Ascending _ 

 colon 

 Ileum, lower 

 end 



Pancreas 



Splenic flexure 01 

 colon 



Jejunum 



Mesentery of 

 descending 

 colon and sig- 

 moid flexure 



Sigmoid 

 flexure, lower 

 end 



Bladder 



Showing relations and attachments of mesentery of small and large intestines ; greater part of transverse colon, 

 of sigmoid flexure and of jejuno-ileum has been removed, the latter by cutting through the mesentery near its 



posterior attachment. 



to the end of the ileum, the part bearing the small intestine remaining free. This 

 oblique line of attachment becomes the permanent mesentery. The peritoneum to 

 the right of it, as far as the ascending colon, forms the permanent parietal perito- 

 neum, having fused with the original parietal layer behind it. When the colon 

 under the liver becomes the transverse, the part nearest to the latter continues free 

 and hangs down as a transverse fold, on which the greater omentum lies, and sub- 

 sequently fuses, as already described. The transverse colon is attached by the 

 transverse mesocolon ^also a secondary adhesion) to the front of the right kidney 

 and to the posterior wall across the second part of the duodenum and the head of 



