38 



ANATOMY FOR NURSES 



[Chap. IV 



(2) In the walls of the blood-vessels (especially arteries), air 

 tubes, and vocal cords. 



(3) Entering' into the formation of the lungs and uniting the 

 cartilages of the laryn.x. 



Adipose tissue. — When fat begins to be formed, it is deposited 

 in tiny droplets ' in some of the cells of the areolar tissue ; these 



Fig. 16. — A Few Fat Cells fkom the Margin of a F.\t Lobule. (Very 

 hiRhly magnified.) f.g. fat globules distending a fat cell ; n, nucleus ; w, membra- 

 nous envelope of the fat cell ; c, capillary vessel ; v, veinlet ; c.l. connective-tissue 

 cell ; the fibres of the connective tissue are not shown. (Schafer.) 



droplets increase in .size, and eventually run together so as to form 

 one large drop in each cell. By further deposition of fat the cell 

 becomes swollen out to a size far beyond that which it possessed 

 originally, until the protoplasm remains as a delicate envelope 

 surrounding the fat drop. The nucleus is crowded off to one side 

 and attached to the cell wall. As these cells increase in number 

 they collect into small groups or lobules, which lobules are for the 

 most part lodged in the meshes of the areolar tissue, and are also 

 supported by a fine network of blood-vessels. This fatty tissue 

 exists very generally throughout the body, accompanying the still 

 more widely distributed areolar tissue in most parts, though not 

 in all, in which the latter is found. Still, its distribution is not 



• The contents of the fat cells of adipose tissue are fluid during life, as the normal 

 temperature of the body is considerably above the melting point of the mixture 

 of fats found there. 



