THE JEJUNUM 'AND ILEUM 



1295 



submucosa and form a plexus, from which branches go to the mucous membrane. Some of 

 these enter the villi; others form plexuses about the glands of Lieberkuhn (Birmingham). The 

 details of the arterial blood supply of the small intestines are given on page 664. 



FIG. 1025 



FIG. 1026 



Three feet. 



Six feet. 



FIG. 1027 



FIG. 1828 



Nine feet. 



Twelve feet. 



FIG. 1029 



FIG. 1030 



Seventeen feet. 



Twenty feet. 



FIGS. 1025, 1026. 1027, 1028, 1029. 1030. Diagrams showing the arrangement and variations of the loops of 

 the mesenteric vessels for various segments of the small intestine of average _length. Nearest the duodenum the 

 mesenteric loops are primary, the vasa recta are long and regular in distribution, and the translucent spaces 

 (lunettes) are extensive. Toward the ileocolic junction, secondary and tertiary loops are observed, the vessels 

 are smaller and become obscured by numerous fat-tabs (After Monks.) (See p. 1270 for detailed description.) 



