96 ' LABORATORY METHODS OF 



The mucous coat is composed of stratified epithelial 

 cells resting upon a basement membrane. 



The muscularis mucosse is composed of a .band of 

 smooth muscle located just under the mucous coat. 



The submucous coat consists of fibrous tissue, lym- 

 phatics, nerves, blood vessels and glands, which empty 

 their contents into the esophagus. 



The muscular coat is composed of two layers of 

 muscle tissue, the inner layer being placed circularly 

 and the outer layer placed longitudinally. The upper 

 third is composed of the involuntary variety. 



The fibrous coat is composed of a thin layer of white 

 fibrous tissue and a few fibers of yellow elastic tissue. 



Exercise No. 52. Make a T. $. of the esophagus. 



Technic: Formalin, celloidin and H. & E. 

 Make out all the coats and describe the tissue in 

 each. 



STOMACH. 



The stomach consists of the usual four coats : mu- 

 cous, submucous, muscular and fibrous. The muscu- 

 laris mucosae belongs to the mucous coat. 



The mucous coat consists of a basement membrane 

 resting upon a stroma of connective tissue, and sup- 

 porting a layer of columnar epithelial cells. In this 



