126 



THE ALIMENTARY SYSTEM. 



The outer or fibrous investment of the oesophagus consists 

 of areolar tissue continuous with that surrounding the adja- 

 cent structures. 



FIG. 53. The Stomach. 



The walls of the stomach (Fig. 

 53) may be divided into four 

 coats, which are, from within 

 outward, the mucosa (containing 

 two kinds of glands, peptic and 

 pyloric), the submucosa, the 

 muscular layer, and the serous 

 or peritoneal covering. 



The mucosa consists of the 

 epithelial covering, subepithelial 

 connective tissue, muscularis 

 miicosa?, lymphoid tissue, and 

 the peptic and pyloric glands. 

 The epithelial lining of the 

 stomach consists of a single layer 

 of long columnar epithelium- 

 cells, with their nuclei situated 

 near their attached bases ; among 

 the columnar cells goblet-cells 

 are abundant. The surface of 

 the stomach dips down into 

 closely crowded tubular depres- 

 *sions, the gastric glands, which 

 arc perpendicular to the surface 

 and occupy the entire thickness 

 of the mucosa. They are of two 

 kinds, peptic and pyloric. 



The peptic or cardiac glands 

 occupy the cardiac portion and 

 fund us of the stomach, yielding 

 to the pyloric glands' at the 

 pyloric extremity. The peptic 

 glands are simple or slightly 

 divided tubular glands, often 

 with the lower blind ends some- 



Diagrammatic section through coats 

 of stomach (Mall). TO, mucosa- e 

 epithelium; d, outlet of peptic 

 gland; mm, muscularis mucosse; 

 am, submucosa ; cm, inner circular 

 muscular layer; lm, outer longi- 

 tudinal muscular layer- neri- 

 toneum. 



