ABDOMINAL CAVITY 



475 



of peritoneum which passes from the lower border of the ileum to the anterior 

 surface of the mesentery of the appendix or, sometimes, to the appendix 

 itself. The retro-ccecal or retro-colic fold passes upwards behind the 

 upper part of the caecum and the lower part of the ascending colon ; 

 when it is present the vermiform process usually lies in it. 



The inter-sigmoid fossa should also be looked for at this stage, in 

 order that, if it is present, its boundaries may be examined before they are 

 interfered with by dissection. It runs upwards behind the root of the 



Jpper recess of 

 oriental bursa 



Right colic 



flexure (O.T. 



lepatic flexure) 



Right lateral 

 part of lower 

 )eritoneal com- 

 partment 



scencling colon 



Caecum 



Vermiforrr 

 process 



Transverse colot 



Left colic flexun 

 (O.T. splenic 

 flexure) 



Left lateral part 

 of lower perito- 

 neal compart- 

 ment 



Descending 

 colon 



Iliac colon 



Mesentery of 

 small intestine 



Pelvic colon 

 FIG. 183. Abdomen after removal of Liver, Stomach, Jejunum and Ileum. 



pelvic meso-colon at the left side of the last lumbar vertebra. To find it, 

 turn the pelvic part of the colon upwards. 



Dissection. After he has examined any of the occasional peritoneal 

 fossse which happen to be present the dissector should remove the 

 right layer of the peritoneum of the mesentery, the inferior layer of the 

 transverse meso-colon, and the peritoneum of the posterior wall of the 

 abdomen between the root of the mesentery and the ascending colon. 

 Commence at the upper end of the jejunum and pass downwards to the 

 lower end of the ileum, then upwards along the right side of the posterior 

 wall of the abdomen ; finally clear away the lower layer of the transverse 

 meso-colon. 



