DIGESTION. 



179 



The cardiac, fundic, or peptic glands, are formed by an involu- 

 tion of thrtasement nTemBrane Of the mucosa and lined by epithelial 

 cells. Each gland may be said to consist of a short duct, or neck, 

 and a body or fundus (Fig. 73). The latter portion is wavy or 

 tortuous and frequently subdivided into as many as 8 to 10 distinct 



and separate tubules. The duct 

 is lined by columnar epithelial 

 cells similar to those covering 

 the surface of the mucosa. The 

 lumen of the fundus is bordered 

 by epithelial cells, cuboid in 

 shape, and consisting of a gran- 

 ular protoplasm containing a 

 distinct spherical nucleus. These 

 cells are generally spoken of as 

 the chief or central cells. In 

 addition to the chief cells, the 

 fundus contains a second variety 

 of cell, which is of a larger size, 



FIG. 73. PEPTIC GLAND FROM 

 STOMACH OF DOG. a. Wide 

 mouth and duct which receive 

 the terminal divisions of the 

 gland, b, c. Neck and fun- 

 dus of the tubes, e. Central 

 or chief cells, d. Parietal or 

 acid cells. (After Piersol.) 



x Lumen. 



capillaries. 



FIG. 74. SECTION OF FUNDUS GLAND 

 OF MOUSE. Left upper half drawn 

 after an alcohol preparation, right 

 upper half after a Golgi prepara- 

 tion. The entire lower portion is a 

 diagrammatic combination of both 

 preparations . (Stohr . ) 



of a triangular or oval shape, and consisting of a finely granular pro- 

 toplasm. From this situation just beneath the gland wall they have 

 been termed parietal or border cells. Each parietal cell appears to 

 be surrounded and penetrated by a system of passages which open 

 into the lumen of the gland by means of a delicate cleft or canaliculus 



