190 GENERAL ANATOMY. 



that of the mucous membrane in another of the same produc- 

 tion. Such as, for instance, the membranes of fistulas. 



Every time that either by mechanical lesion, by the effects 

 of cauterization, gangrene, or ulceration, there is a destruction 

 of the teguments, or even of the subjacent parts to a greater or 

 less depth, a tegument is always produced similar to the one 

 destroyed, or at least very analogous to it, and similar in its 

 whole extent, whatever be the diversity of denuded parts 

 that are to be reclothed by it. After the primitive phenomena, 

 varying according to the causes of the injury, there is a series 

 of secondary ones always similar: they are 1st, the production 

 of a plastic layer like that of agglutination ; 2d, the formation of 

 buds or granulations, and the secretion of pus; 3d, the cessa- 

 tion of this secretion, and the completion of the cicatrix. The 

 phenomena of cicatrization commence by the deposition of a 

 plastic layer similar to that which constitutes the false mem- 

 branes. This layer at first is inorganic, but soon becomes or- 

 ganized, covered with little red, conical granulations, and consti- 

 tuting then the membrane of the fleshy granulations; this mem- 

 brane is cellular, vascular, very contractile, sensible, absorbent, 

 secreting pus, apt to be destroyed by ulceration, and quickly 

 reproduced. This membrane is continually contracting, the 

 secretion of pus gradually diminishes, and finally ceases, when 

 it becomes covered, either with a distinct epidermis, or with 

 mucus, according to the part, and constitutes a new tegument, 

 very analogous, and sometimes absolutely similar to the old 

 one. This membrane, however, besides some slight anatomi- 

 cal differences, is much more susceptible of ulceration than the 

 primitive teguments. 



259. In abscesses, and particularly in chronic abscesses, a 

 membrane is formed which circumscribes the pus, and which 

 strongly resembles the mucous membrane; this resemblance 

 is 'still greater, when the abscess is opened and remains the 

 source of a fistulous ulcer; it is the same with that kind of ul- 

 cers kept up by necrosis, or the presence of foreign bodies; it 

 is also the same with true fistulas, or the accidental canals 

 which arise from a natural mucous cavity. In every case, the 

 passage is lined through its whole extent by a fungous, soft, 



