342 



THE ABDOMEN AND PELVIS 



The sigmoid arteries, three or four in number, supply the 

 iliac and pelvic cola. They anastomose freely with one another, 



Superior 

 mesenteric 

 artery 

 Right para- 

 colic gutter 

 Right and 

 middle colic 



Lower 

 of left 

 kidney 



FIG. 107. The Posterior Wall of the Infra-colic Compartment. The greater 

 omentum and the transverse colon have been thrown upwards. The 

 mesentery has been divided close to its root and removed together with 

 the coils of the jejunum and ileum. A small part of the pelvic colon 

 and its mesentery has been resected to expose the pelvic portion of the 

 left ureter. 



forming arterial arcades across the iliac fossa and in the pelvic 

 meso-colon. The highest of the series similarly anastomoses 

 with the descending branch of the left colic. The anastomosis 

 between the lowest sigmoid and the superior haemorrhoidal is 



