DIGESTION 



215 



when the caecum contracts material must cross the opening of 

 the ileum in order to reach the colon (Fig. 75). This sphincter 



d 



Fig. 73. — Cecum of the Horse in Position, its Inner Face being seen. 

 1, The first colon ; 2, the ileum. 



Fig. 74. — Schematic Arrangement of the Longitudinal Muscular Bands 



of the Cecum. 



Bands 1 and 2 are one, and form a complete sling for the bowel ; band 4 runs 

 from the caecum to the pelvic flexure of the colon. It is a remarkable band, 

 and doubtless intimately connected with the mechanism which brings 

 about the passage of material from caecum to colon. 



is furnished by the thickened condition of the wall of the ileum. 

 We see no difficulty in believing that the rigid end of this tube 



