320 



EPITHELIAL AND ENDOTHELIAL TISSUE. 



ing, etc. The motion of the cilia, in the cavity of the uterus 

 tending toward the mouths of the tubes, will assist the sperma- 

 tozoids in reaching the ovum ; while the motion in the Fallopian 

 tubes, leading downward, will carry the ovum into the cavity of 

 the uterus. 



In man, ciliated epithelia are found in only a few localities. 

 They exist in the respiratory portions of the nasal cavity; in 

 the Eustachian tubes j in the 

 labyrinth (hair-cells) j in the 

 larynx, beginning from the \ 

 under surface of the epiglot- 

 tis, with the exception of the 

 vocal bands j in the trachea, 

 the bronchi, and bronchioli ; 

 also in the ejaculatory ducts 

 and the vas deferens of the c ' 

 male, and in the uterus and 

 the Fallopian tubes of the 

 female. (See Fig. 137.) 



In lower animals, the c 

 iated epithelia and endothelia 

 are far more abundant; in 

 the frog, for example, they 

 are present in the cavity of 

 the throat, the pericardiac 

 sac, etc. An easily accessible 

 place for obtaining ciliated FlG ' IST.-CILIATED COLUMNAR EPITHE- 



LIA, FROM THE NASAL CAVITY OF 



MAN. 



epithelia, exhibiting acute 

 movements, is the seam of 



the mantle of fhp nv^W E ' r W f columnar epithelia; E\ detached 



tne Oyster, epithelia; Pi, irregularly shaped plastids wedded 



Open the Valves CUt Off a in between the feet of the epithelia; (7, connective 



TI , . ' , tissue, bounded toward the epithelia by a light 



Small portion trom the most seam ; S, the basement membrane. Above this a 



endotlielia is ^ isible - Magnified 500 



pigmented seam, transfer it 

 to the slide with a small drop 

 of the juice of the oyster, and cover with a very thin covering- 



The feet of the columnar epithelia that is, the extremities 

 opposite the basis, and serving for attachment to the subjacent 

 connective tissue are sometimes blunt, sometimes very thin and 

 curved, with bifurcations or indentations. The latter feature, 

 especially in the juvenile condition of the epithelia, is due to 

 the presence of relatively small, many-shaped plastids, which 



