76 



GENERAL ANATOMY OF THE TISSUES. 



a. Epithelium in a single stratum. 



(1.) With rounded, polygonal cells (pavement-epithelium in a single 

 layer). 



This exists as an investment of the true serous membranes, of most 

 synovial membranes, of the cerebral ventricles (ependymd) of the mem- 

 brane of Demours, of the back of the iris, and of the inner surface of the 

 choroid (pigment layer), of the capsule of the lens and of the retina, of the 

 internal ear, of the endocardium, of the veins, ftf many glandular vesicles 

 and canals (racemose glands, kidneys, sudoriparous and ceruminous 

 glands, lungs), and of the ductus interlobulares of the liver. 



Fig. 13. 



Fig. 14. 



(2.) With fusiform, superficially-united cells (fusiform epithelium). 



Epithelium of the arteries, and of many veins. 



(3.) With cylindrical cells (cylinder-epithelium). 



In the intestine from the cardia to the anus, in Lieberkiihn's glands, 

 in the excretory ducts of the gastric glands, as well as of all the other 

 glands which open into the intestine ; also of the lacteal and lachrymal 

 glands ; in the male urethra, the vas deferens, the vesiculce seminales, the 

 excretory ducts of the prostate, of Cowper's, Bartholini's, and the ute- 

 rine glands. 



Fig. 15. Fig. 16. 



(4.) With cylindrical or conical ciliated cells (simple, ciliated cylinder- 

 epithelium). 



Epithelium of the finest bronchise, of the nasal cavities, of the inner 

 surface of the membrana tympani, of the Eustachian tube, of the uterus, 



FIG. 13. Epidermis of a two months' human embryo, still soft like epithelium; mag- 

 nified 350 diam. 



FIG. 14. Epithelial cells of the vessels, the longer ones from the arteries, the shorter 

 from the veins. 



FIG. 15. Epithelium of the intestinal villi of the rabbit; magnified 300 diam. 



FIG. 16. Ciliated cells from the finer bronchise; magnified 350 diam. 



