THE GREAT COLON 427 
the medial surface of the base of the czecum 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. 
The sternal flexure extends forward to 2 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 
Fic. 367.—Axspommnat Viscera oF Horse; VENTRAL VIEW. 
The ventral wall and part of the lateral walls of the abdomen are removed. C., Czcum; 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 cecum; 6, medial band of cecum; 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, xiphoid 
cartilage; h, teats. (After Ellenberger-Baum, Top. Anat. d. Pferdes.) 
it is only about two to three inches (ca. 5 to 7.5 em.) in diameter.! This soon 
increases to about eight to ten inches (ca. 20 to 25 em.) for the ventral parts. 
Beyond the pelvic flexure the diameter is reduced to about three or four inches 
(ca.8to9em.). Toward the diaphragmatic flexure the caliber rapidly increases, and 
reaches its maximum in the last part, where it forms a large sacculation, which may 
1 Usually there is a sacculation of considerable size which succeeds the constricted origin. 
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