ABDOMINAL CAVITY 



473 



into the pelvis, and not uncommonly some coils of the 

 jejunum may be found in the left hypochondrium. 



Meckel's Diverticulum. In about 2 per cent of subjects dissected a 

 blind, hollow protrusion, termed Meckel's diverticulum, juts out at a right 

 angle from the wall of the ileum at a point rather less than three feet 

 from the junction of the small intestine with the ceecum. It represents 

 a persistent portion of the vitelline duct of the embryo, and under certain 

 circumstances it may lead to conditions which require surgical interference. 



DUODENO-. 

 JEJUNAL FLEX:) 



ILEIU 



WERMIFORM APPENDIX. 



FIG. 182. The Mesentery in a subject which was hardened by formalin 

 injection. The jejunum and ileum have been removed, and the foldings 

 of the mesentery are displayed. 



The Mesentery of the Small Intestine. -The mesentery 

 of the small intestine is an extensive fold of peritoneum by 

 which the jejunum and ileum are attached to and suspended 

 from the posterior wall of the abdomen. Its posterior border 

 or root is attached along an oblique line which extends, from 

 above downwards and to the right, from the left side of the 



