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 







-=. ^ -Zrfi^Z; Corneum or 



-", horny layer. 



Stratum 

 lucidum. 

 \ Stratum 

 granule sum. 



'>j Malpighian 



2Q r g f r - 



inal layer. 



away quite regularly 

 in thin lamellae. The 

 deeper layers are ar- 

 ranged to form papil- 

 lae that interlock with 

 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. 



Fig. 2 1 . Section of epidermis of skin 

 from palm-surface of finger. 



