THE GREAT COLON 



427 



the medial surface of the base of the ccecuin it turns dorsally and to the left behind 

 the left sac of the stomach; here it becomes constricted, and joins the small colon 

 below the left kidney. 



^^^- ^^'?^^^ flexure extends forward to a point opposite to the ventral part of the seventh rib 

 and the diaphragmatic flexure as far as the sixth intercostal space on the right of the median plane! 



The caliber of the great colon varies greatly at different points. At its origin 



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Fig. 367. — Abdominal Viscera of Horse; Ventral View. 

 The ventral wall and part of the lateral walls of the abdomen are removed. C, Ceecum; r.v.C, right ventral 

 part of colon; v.Q., sternal flexure of colon; [l.v. C, left ventral part of colon; d.Q., diaphragmatic flexure of colon; 

 D., small intestine; M., small colon; a, ventral free band of ceecum; h, medial band of caecum; c, lateral band of ventral 

 part of colon d, ventral band of ventral part of colon; e, point of elbow; /, anterior end of sternal region; g, xii^hoid 

 cartilage; h, teats. (After Ellenberger-Baum, Top. Anat. d. Pferdes.) 



it is only about two to three inches (ca. 5 to 7.5 cm.) in diameter,^ This soon 

 increases to about eight to ten inches (ca. 20 to 25 cm.) for the ventral parts. 

 Beyond the pelvic flexure the diameter is reduced to about three or four inches 

 (ca. 8 to 9 cm.). Near the diaphragmatic flexure the caliber rapidly increases, and 

 reaches its maximum in the last part, where it forms a large sacculation, which may 



^ Usually there is a sacculation of considerable size which succeeds the constricted origin. 



