52 NORMAL HISTOLOGY AND ORGANOGRAPHY. 



2. Stratified epithelium, consisting of several 

 layers of epithelial cells. 



Fig. 1 8. Ciliated epithelium from trachea. 



(a) Transitional, consisting of two or three layers 

 of cells, found in the wall of the bladder, ureters, 

 pelvis of kidney, and prostate portion of male 

 urethra. In this case the surface layers of cells are 



Pavement cells. 



Interstitial cells. 

 Fig. 19. Epithelial cells from the bladder. 



flat, often polynucleated and form a mosaic pattern 

 upon the second layer, which is pear-shaped, with 

 the broad ends forming depressions into the first 

 layer of cells. The third layer consists of smaller, 

 irregular, interstitial cells that fill the spaces between 

 the pointed ends of the second row. 



