70 



THE HORSE IN HEALTH AND DISEASE 



l)ut IK.) distinct lines of division exist. "Ilie narrow, yellowish- 

 gray zone next to the non-Kl:in(Uilar portion contains the short, 

 tubular cardiac (jlaiulx. Next to this lies a laro;e mottled, reddish- 

 brown area containing the fundiM glands. The rest of the mucous 

 membrane is reddish-f^ray in color and contains the pyloric glands. 

 The muscular layer is composed of involuntary fibers arranged in 

 longitudinal, circular, and ol)lique fashion. The serous layer is a 



(Irjl txlnmilu) 



Ar^'i nf G/lnrhment lo <]ia- 

 jil'raij/n {itijii-pentoneal) 



Fig. 17. — Visceral f.urfacc of stomach, with first part of duodenum. 

 Fixed in silu when full, but not distended. (Sisson, Anatomy of Domestic 

 Animals.) 



reflexion of the peritoneum and is continuous with the great omen- 

 tum. 



The small intestine is a tube averaging about I5 inches in di- 

 ameter and 7.") feet long, originating at the stomach and ending at 

 the cecum. It is arbitrarily divided into the duodenum, jejunum, 

 and ileu)n. The first part is fixed, while the others are floating. 

 It is held in position by the great mesentery. The bulk of the small 



