TISSUES. 



53 



(6) Stratified Squamous. In this case the super- 

 ficial layers are flat and the deeper ones cuboidal 



Pavement cell. 

 Pear-shaped cell, 



Interstitial cell. 



Fig. 20. Section of bladder epithelium. 



or columnar. This is the most extensive of the 

 epithelial tissues. It forms the epidermis of the 

 skin, the walls of the oral cavity and the esophagus, 

 the epithelium of the 

 conjunctiva, external 

 auditory canal, va- 

 gina, and the exter- 

 nal sheath of hair 

 follicles. 



The outer cells be- 

 come horny and scale 

 away quite regularly 

 in thin lamellae. The 

 deeper layers are ar- 

 ranged to form papil- 

 1* that interlock with ** g!S** *" 

 connective tissue pa- 

 pillae and thus not only anchor the epithelium to the 

 subjacent tissue, but increase the absorbing surface 

 by approximating a larger number of epithelial cells 

 to the underlying blood and lymph capillaries. 



Corneum or 

 i~-~^=~. _-^^=g~^~r-; horny layer. 



Stratum 

 - lucidum. 

 ' Stratum 



granulosum. 



Malpighian 



or germ- 

 inal layer. 



