5G 



THE CONNECTIVE TISSUES 



tions of starvation the fat stored in these cehs is hberated by met- 

 aboHsm and used as a source of energy. The cells then resume a 

 condition in which only scattered droplets appear in the cytoplasm, 

 but with favorable conditions the storage may be repeated. Fat 

 accumulated during the summer season in hibernating animals is 

 metabolized during the winter dormant season in maintaining the 

 life of these forms. 



In ordinary routine techniques preparing tissue for examination, 

 the fat is dissolved out, leaving the cells as mere empty shells in the 

 final preparation. Fat cells may be handled so that the fat is 

 fixed, as when using osmium tetroxide, and carried through to the 

 final preparation. Other solutions, such as Sudan ITT, stain fat 

 specifically and may also be used to indicate it. 



Fig. 32.— Adipose tissue of the fat body of Amblystoma. 



DENSELY ORGANIZED COLLAGENOUS AND ELASTIC 

 CONNECTIVE TISSUES. 



Under this heading there are irregularly arranged tissues resem- 

 bling the loose fibroelastic type but having their intercellular 

 material present in far greater (juantity. There are other types in 

 which the intercellular fibrous materials, either elastic or collagenous, 

 are arranged ])aralleling each other. 



Dense irregularly arranged fibroelastic tissue with the collagenous 

 fibers ])red()miuating and with ])roportionately few cells, which are 

 mainly fibroblasts, forms the dermis of the skin in mammals, i)art 



