TORSION OF THE DOUBLE COLON 



247 



and then ascends towards the lohi, being here of immense 

 volume — in fact, at its largest diameter. It then suddenl3' 

 contracts, and forms the single colon (see Figs. 19 and 20). 



Fig. 



ig. — The Double Colon looked at from Above 

 (modified from MUller). 



I, The first colon, the cscum being removed; 2, the pelvic flexure, 

 the bowel being narrow ; 3, the colon suddenly enlarges ; 4, its 

 diaphragmatic flexure; 5, the single colon. Several of the 

 bands are seen; note also the sacculated and non-sacculated 

 portions of the bowel. (Smith's ' Veterinary Physiology.') 



The object of the difference in the volume of the double 

 colon appears to be for the convenience of its accommodation 

 jn the abdominal cavity. 



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