OF THE INTERIOR MUSCLES. 437 



Accidental productions, either of analogous tissues or mor- 

 bid tissues, are rarely observed' in the muscles. Accidental 

 bones are, however, sometimes found in them. I once found 

 a mixed osseous and cancerous production, occupying the 

 muscles of the calf of the leg. The leprous cysticercus, 

 cysticercus cellulosx of Rudolphi, is sometimes found in the 

 muscles of man, and often in those of swine. Accidental 

 production of the muscular tissue is very rare, if indeed it 

 ever takes place. An affinity has, however, been established 

 between the sarcoma and the muscular flesh. It is also said 

 that accidental muscular productions have been seen in the 

 serous membranes, in the bones, and in the ovaries: it appears 

 that the observers have suffered themselves to be deceived by 

 appearances. 



The development of the muscular texture in the uterus, 

 during pregnancy, and the disappearance of that texture after 

 accouchement, is somewhat analogous to an accidental produc- 

 tion. 



700. The functions of the muscles present varieties and 

 alterations, some of which have their seat and their cause in 

 the muscular tissue itself, and others in the nervous system. 

 These varieties and these changes are, for the most part, dif- 

 ferent in the two species of muscles, and almost all are pecu- 

 liar to the full, external, voluntary muscles, or to those of the 

 animal functions. 



SECTION II. 



OF THE INTERIOR MUSCLES. 



701. These muscles, which are also called hollow muscles, 

 involuntary muscles, and muscles of vegetative or organic 

 functions, have no name appropriated to themselves, each of 

 them bears that of the organ it concurs in forming. 



702. These muscles are, 1, the heart; 2, those which dou- 

 ble the mucous membrane of the alimentary passages through- 



