PKLVIS MINOR 



453 



twigs from the pelvic plexuses, and from the third and fourth 

 sacral nerves, should be noticed and preserved. As the dissector 

 approaches the posterior pelvic wall he must pull the rectum 

 forwards, and as he does that he should note that branches 

 from the sympathetic trunk and from the third and fourth 

 sacral nerves pass to its walls. Whilst the pelvic fascia is being 



Sup. haetnorrhoidal 

 artery 



Lateral sacral artery 



Branch of sup. hae- 



rnorrhoidal artery 



Rectum 



ric artery 

 (ant. division) 



Middle hsemorrhoidal 

 artery 



"" Left ureter 



Genito-femoral 

 nerve 



Hypogastric arter 



External iliac artei 

 Fascia on psoas 



Inferior vesical 



'artery 



Ductus deferens 



Inferior epigastric 

 artery 



Umbilical artery 

 (obliterated) 

 Obturator ner\ e 

 Obturator arteiy 

 Obturator vein 



Internal spermatic 

 artery 



Hremorrhoidal veins 



Bladder 

 Superior vesical arterie 



FIG. 216. The Structures exposed in the left half of the Pelvis Minor 

 by the removal of the peritoneum and extraperitoneal fat. 



removed from the sacral region care must be taken not to injure 

 the pudendal and coccygeal plexuses and their roots and the 

 sympathetic trunk, which all lie immediately behind the fascia. 

 The lateral sacral arteries will serve as useful guides, for as they 

 run medially, from the posterior division of the hypogastric 

 artery, they lie in front of the sacral plexus, and as one or other 

 of them descends along the front of the sacrum it lies im- 

 mediately to the lateral side of the sympathetic trunk and in 



