XVI.] 



STRIPED OF STRIATED MUSCLE. 



igg 



ill balsam. In this the cut ends of the capillaries between the 

 fibres will be seen (figs. 176, 177). 



It is to be noted that there is a difference in the T.S. of con- 

 tracted and uncontracted muscles (Spatlahnlz). Beautiful figures 

 are given in. 1 



11. L.S. Bed Muscle of Rabbit Injected (L). Use the semi- 

 tendinosus or soleus of a rabbit. This shows the same general 

 arrangement of the blood-vessels, but some of the transverse 

 branches and some of the veins have small dilatations or ampullae 

 upon them, while the capillaries are usually more tortuous than 

 those of the pale muscles. 



CARDIAC MUSCLE. 



12. Harden small pieces of the heart in 20 per cent, nitric 

 acid (forty-eight hours), or 2 per cent, potassic bichromate or 

 ammonium chromatc for thirty-six to forty-eight hours. Tease a 

 small piece in Farrant's solution. Small pieces of muscle cardiac 

 placed fresh in picro-carmine for several days show the structure 

 well when mounted in glycerine. 



Kid. 177. -T.S. Muscle In- 

 jected. M. Muscle, 

 with n. Nuclei, ft. l.lood- 

 vessel (capillaries). 



FIG. 178. Muscular Fi- 

 bres of the Human 

 Heart. 



Firs. 179. -T.S. of a 

 Fresh Fro/en M oscu- 

 lar Fibre, showing 

 Cohnheim's areas. 



(a.) Observe the faintly transversely -striated fibres made up of 

 short quadrilateral pieces with short oblique processes, which join 

 other muscular fibres. The muscle-cells branch and anastomose. 

 A rather indistinct line of clear cement joins the ends of adjacent 



cells. 



(/;.) There is no sarcolemma, but a well-defined nucleus lies in 

 the substance of the fibre, while the transverse striation is much less 



1 " Die Vertheilung d. Blutgcfiisse iin Muskcl," Abhand. d. math. phys. 

 $la$scd. k. Sciehsig. Gesdl. d. Wissensch., 1888. 



