AREOLAR TISSUE. 35 



which it is influenced will be considered hereafter. (See 

 chapter on Motion.) 



Epithelium is devoid of blood-vessels, and lymphatics. 

 The cells composing it are nourished by absorption of 

 nutrient matter from the tissues on which they rest ; and 

 as they grow old they are cast off and replaced by new cells 

 from beneath. 



Areolar, Cellular, or Connective Tissue. 



This tissue, which has received various names according 

 to the qualities which seemed most important to the authors 

 who have described it, is met with in some form or other in 

 every region of the body ; the areolar tissue of one dis- 

 trict being, directly or indirectly, continuous with that of 



Fig. 8.* 



all others. In most parts of the body this structure 

 contains fat, but the quantity of the latter is very variable, 

 and in some few regions it is absent altogether (p. 38). 



* Fig. 8. Filaments of areolar tissue, in larger and smaller bundles, 

 as seen under a magnifying power of 400 diameters (Sharpey). 



D 2 



