TISSUES AND ORGANS 



23 



epithelium each of the cells is surmounted 

 by tapering, haiiiike filaments (Fig. 10). 



Compound epithelium is composed of more 

 than one layer of cells (Fig. 11). Epithe- 

 lium contains no blood vessels, but is nour- 

 ished by lymph. It forms the external layer 

 of the skin and the mucous membrane. 



17. Connective Tissues exist in many diverse 

 forms, but all are alike in origin, being devel- 

 oped from the same layer of the embryo ; 

 alike in structure, having a large amount 

 of intercellular material ; and alike in func- 

 tion, being devoted to supporting and connecting the 

 master tissues. 



Fig. 10. Cili- 

 ated epithe- 

 lium from a 

 small bron- 

 chial tube. 



A B 



Fig. 11. Compound stratified epithelium. 



A vertical section of the skin. B lateral view of the cells. 



C flat side of scales like d, magnified 250 diameters, showing the nucleated 

 cells transformed into broad scales. 



Areolar tissue is made up of cells, white and yellow 

 fibers, and some intercellular matter (Fig. 12). It is 

 found widely distributed through the body, appearing as 

 delicate, elastic, sheathing membrane for muscles, nerves, 

 glands, and other organs. It penetrates into the sub- 

 stance of the organs and connects and supports their 

 various parts. 



