JEJUNUM AND ILIUM. 



569 



FIG. 184. A 



B 



ends in the right iliac re- 

 gion. There is no natural 

 division showing where 

 one of these intestines 

 terminates, and the other 

 hegins. The upper two- 

 fifths, however, are gener- 

 ally assigned to the jeju- 

 num, and the lower three- 

 fifths to the ilium. These 

 intestines are very much 

 coiled on each other, and 

 are convex in front, and 

 concave behind, where 

 they are attached 

 to the mesentery. 

 The serous coat 

 forms a complete 

 covering to these 

 intestines, except 

 at the small trian- 

 gular space where 

 the hlood- vessels 

 enter; consequent- 

 ly there is free- 

 dom of motion, 

 though both are 

 kept in their natu- 

 ral places by their 

 connection with 

 the mesentery. 



FIG. 184, A represents a section of the lower portion of the Ilium, and com- 

 mencement of the Colon, a a Ascending colon. 66 Ccecum, or caput coli. 

 cc Lower portion of the ilium, d d Muscular coat, e e Cellular and mucous 

 coats. // Folds of mucous coat at the beginning of the colon, gg Cellular 

 coat prolonged into the folds, h h llio-colic valve, i i Where the coats of 

 the ilium and colon unite. 



FIG. 184, B represents the Mesentery, a a Mesentery suspended. 6 6 b 

 Small intestine, c Mesenteric glands. 



