484 



DIGESTIVE SYSTEM OF THE PIG 



opening is slit-like and is bounded above and to the left by a fold which contains a 

 thickening of the internal oblique layer of the muscular coat. The opening into 

 the diverticulum is situated above and a little to the left of the cardia; it is trans- 



FiG. 421. — Everted Stomach of Pig, from which the 

 Mucous Membrane has been Removed. 



Fig. 420. — Visceral Surface of Stomach of Pig, 

 FRO.M \yhich the Serous Coat has been Re- 

 moved. 



0, CEsophagus; D, duodenum; Di, diverticulum; a, a', a", a"' , longitudinal fibers; 6, circular fibers; f, external 

 oblique fibers; r', internal oblique fibers; c" , cardiac loop; d, fibers which connect branches of cardiac loop; ./', fold at 

 entrance to diverticulum; p,, pj-loric sphincter; p', pyloric prominence. (EIIenberger-Baum, .A.nat. d. Haustiere.) 



versely oval, and is bounded (except laterally) by a thick fold which contains 

 spirally arranged muscular fibers. The mucous membrane may be divided into 

 four regions (Fig. 422). Over a quadrilateral area around the cardia (about one 





Fig. 422. — Diagram of Zones of AIiTcors Membra.ve of Stomach of Pig, 



inch on the right and two or three inches on the left side of the orifice) it is oesopha- 

 geal in character, and presents a number of folds. A sharp line of demarcation 

 separates this from the rest of the mucous membrane, which is soft and glandular. 

 The cardiac gland region is pale gray in color and thin (ca. 0.5 to 1 mm.) ; it extends 



