2O 



ELEMENTS OF HISTOLOGY. [Chap. in. 



Fig. 14. From a Vertical Section through the 

 Epidermis. 



a, The stratum Malpighii ; 6, the stratum granulosum ; 

 c, the stratum lucidum ; d, the stratum corneum. 

 (Atlas.) 



of globular or elliptical granules of the nature inter- 

 mediate between protoplasm and keratin. Their sub- 



^^^^^ .^-.-..---^^^gg^^-gg-^ stance is called 



(Ran- 

 these 



eleidin 

 vier) ; 



cells form the 

 granular layer 

 (stratum gra- 

 nulosum) of 

 Langerhans. 

 Deeper down 

 the cells be- 

 come less flat- 

 tened and more 

 polyhedral, and 

 the deepest 

 form a layer of 

 more or less 



columnar cells, placed vertically 011 the surface of 



the subjacent corium. 

 The substance of the 



hairs, nails, claws, hoofs, 



consists of horny scales. 



(See chapter on Skin.) 

 22. The stratified 



pavement epithe- 

 lium (Fig. 15) lining the 



cavity of the mouth, the 



surface of the tongue, the 



pharynx and oesophagus 

 of man and mammals, and 

 the anterior surf ace of the 



cornea, &c., is, as regards Fig 15 _ From a Vertical Section 



the Style and arrange- through the anterior layers of the 



ment of the cells, identi- Cornea ' 



. .,1,1 > The stratified pavement epithelium ; 



Cal With the Stratum 6, the substantia propria, with the 



* i i ^j_i -i corneal corpuscles between its lamelliB. 



Malpighii of the epider- (Handbook.) 



