THE CELLULAR SYSTEM. 



73 



Q. If granulations are uniformly cellular throughout 

 the textures, how is it that the various organs are re- 

 newed? 



*#. In the cells of these granulations, depositions are 

 made of the nutritive matter, peculiar to the various 

 organs. For instance, when the bone is broken, gelatine 

 and phosphate of lime are thrown into the granulations ; 

 if a muscle is to be renewed, fibrine is deposited. 



Q. Explain the difference in this third period of cica- 

 trization in the internal and external lesions? 



A. The third period is that of deposition of nutritive 

 matter spoken of in the last question. Now, in the inter- 

 nal organs, nutritive matter is deposited; but in external 

 lesion, pus is exhaled and thrown off, as possessing no- 

 thing nutritive or reuniting. 



Q. In external cicatrices, what comes of the fatty mat- 

 ter contained in the cells? 



t#. They are emptied of it in the process of suppura- 

 tion. 



Q. What follows this emptying of the cells? 



#. They sink and adhere to each other, contract, and 

 thus form a uniform substance covered with a membrane. 



Q. When is this membrane of the cicatrix complete? 



v?. When the adhesion between all the cells which first 

 form the fleshy granulations is complete; the membrane 

 is the result of this adhesion. 



Q. Why is this membrane at first red, then white? 



A. Because at first red blood circulates in the exhalents; 

 after a time it leaves them, and returns to its own vessels. 



Q. What parts are most favourable to the formation of 

 cicatrices? 



Jl. Those where the skin yields most, as the scrotum. 

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