EPITHELIUM. 



[OH. ITT. 



CLASS i. Simple epithelium, ; that is, an epithelium consisting 

 of one layer of cells only. Its subgroups are as follows : 



a. Pavement epithelium. 



b. Cubical and columnar epithelium, 

 o. Ciliated epithelium. 



Fig. 28. From a section of the lung of a cat, stained with silver nitrate. N. Alveoli or 

 air-cells, lined with large flat, nucleated cells, with some smaller polyhedral nucleated 

 cslls. (Klein and Noble Smith.) 



Fig 29. Abdominal surface of central tendon of the diaphragm of rabbit, showing the 

 general polygonal shape of the endothelial cells ; each cell is nucleated. X ''300. 

 (Klein.) 



CLASS 2. Compound epithelium ; that is, an epithelium con- 

 sisting of more than one layer of cells. Its subgroups are a 

 follows : 



a. Transitional epithelium. 



b. Stratified epithelium. 



