980 



THE ORGANS OF DIGE8TION. 



num, and makes another excursion to surround the small intestines and returns 

 under the vessels forming the two layers of the mesentery proper. (Take a 

 definite portion of the small intestine and prove this that the mesentery has an 

 upper and a lower layer and the intestine is fastened to the spinal colum by it.) 



Lesser amentum 

 Lesser sac (bursa omentalis) 



Greater sac 



Cavity of great amentum 

 Small intestine 



Pre-vesical space of 

 Relzius 



Symphysis pitbis 



Liver 



Foramen of Winslow 

 Codiac axis 



Pancreas 



Superior mesenteric vessels 



Transverse duodenum 

 Transverse mesocolon 



Mesentery 



Rectum 

 Uterus 



Cul-de-sac of Louglas 



Fio. 606. Diagram to illustrate the reflections and continuity of the peritoneum in a vertical direction in 

 the female body. Section is a little to the right of a median plane. (After Allan Thomson.) 



Next, this layer descends into the pelvis and forms a mesentery for the intes- 

 tine, there surrounding it as low down as the middle of the third sacral vertebra. 

 If anatomists agree to call that intestine the upper part of the rectum, the fold is 

 mesorectum, but if the intestine be called the lower part of the sigmoid flexure, the 

 fold is sigmoid mesocolon, and there is no mesorectum. Just at the third sacral 

 vertebra the peritoneum leaves the posterior surface of the intestine, then the 

 sides, and then the front, and is reflected in the female next upon the upper fifth 



