166 EQUINE ANATOMY. 



vessels : the coecal arteries and veins. Lymphatics, 

 emptying into the sub-himbar receptacle. Nerves, from 

 the great mesenteric plexus. 



Colon. — Division : Large, double or fixed, and small 

 or floating. 



Laege colon. — Length, ten to thirteen feet. Capacity, 

 eighteen gallons. Form and general disposition : rep- 

 resents a large canal with dilatations and contractions, 

 its surface being crossed by longitudinal bands of mus- 

 cular tissue and folded in two; each part being itself 

 doubled in its turn, thus forming four portions. Course: 

 from the arch of the eoecum, the first portion runs for- 

 ward to the posterior face of the diaphragm, forms the 

 suprasternal flexure, turned downwards and to the left; 

 the second portion continues backwards to the entrance 

 of the pelvis, where inflected to the left it forms the 

 pelvic flexure ; the third portion, running forward above 

 and to the left of the second, reaches the diaphragm 

 and forms the diaphragmatic or gastro-hepatic flexure ; 

 the fourth portion bound to the first, extends upwards 

 and backwards to a level with the base of the eoecum, 

 where it ends in the small colon. Modes of attach- 

 ment : by the meso-coecum and meso-colon, by its ad- 

 herence to the pancreas and eoecum directly. Internal 

 surface : like that of the eoecum. Structure : a serous 

 or peritoneal layer, a muscular coat in two layers, and 



