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- 
Fic. 421.—Evertep STOMACH OF PiG, FROM WHICH THE 
Fic, 420.—VisceraL Surrace or Stomacu or Pie 
, 
Mucous MEMBRANE HAS BEEN REMOVED. 
FROM WHICH THE SEROUS COAT HAS BEEN RE- 
MOVED. 
O, Gsophagus; D, duodenum; Di, diverticulum; a, a’, a”, a’’, longitudinal fibers; 6, circular fibers; c, external 
eardiac loop; d, fibers which connect branches of cardiae loop; f, fold at 
(Ellenberger-Baum, Anat. d. Haustiere.) 
oblique fibers; e’, internal oblique fibers; ec”, 
entrance to diverticulum; p,, pyloric sphincter; p’, pyloric prominence. 
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 
Vie. 422.—Dr1acram or Zones oF Mucous MemBRANE OF STOMACH OF Pia. 
inch on the right and two or three inches on the left side of the orifice) it is cesopha- 
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 
