MUSCLE. 



The examination of muscle for trichinae is very simple. 

 Small shreds of the muscle should be teased with needles in 

 some normal fluid medium, and examined at once with a low 

 power ; one giving 50 diameters will be sufficient at first, al- 

 though for a more careful examination one of 250 or 300 

 diameters should be employed. Thin sections can be made 

 with a razor through the trichinous muscle hardened in alcohol, 

 using the proper care that the sections be -made in the direc- 

 tion of the fibres. The worms are seen coiled up as in figure u. 



B 



. u . Trichinous Muscle. 



A, from psoas muscle of hog. B, encysted trichina from arm of man. B, x 35. 



They may be found in any of the transversely striated 

 muscles with the exception of the heart. They are most fre- 

 quently found, however, in the diaphragm and muscles of the 

 jaw and neck. They are in greatest abundance at the ten- 

 dinous extremities of the muscles, for they are here prevented 



42 



