364: LECTURE XV. 



else than a more or less advanced development of adi- 

 pose cellular tissue between the primitive muscular 

 fasciculi. It is a similar process to that which we meet 

 with in the fattening of animals, and which is often 

 exhibited in simply fattened muscles in the human body. 

 Fat-cells insinuate themselves between the primitive 

 muscular fasciculi, and lie of course in stripes in the 

 direction of the muscular fibres, which may remain 

 unchanged. The development in this case has its origin 

 in the interstitial tissue of the muscle. At the com- 

 mencement of the development, 

 and when it proceeds with very 

 great regularity, it may happen, 

 that single rows of fat-cells 

 lying one behind the other al- 

 ternate with the rows of muscu- 

 lar elements. In this case, 

 where the primitive fasciculi are 

 forced asunder, and the circu- 

 lation in the muscle is generally 

 disturbed in consequence of the abundant development 

 of fat, so that the flesh becomes pale it looks to the 

 naked eye as if there no longer existed any muscular 

 tissue whatever. If, for example, in an inferior ex- 

 tremity, which in consequence of an anchylosis of the 

 knee has remained unexercised, the gastrocnemii are 

 examined, we find nothing but a yellowish mass exhi- 

 biting scarcely any striae and without any appearance 

 of flesh, but upon a more minute examination it is dis- 

 covered, that the primitive muscular fasciculi still pass, 

 essentially unaltered, through the fat. In this case the 

 fat forms an impediment to the use of the muscle, but 

 the primitive fasciculi still exist and are to a certain 



Fig. 108. Interstitial growth of fat in muscle (fattening). //. Rowa of intersti- 

 tial fat-cells ; m, wi, m, primitive, muscular fasciculi. 800 diameters. 



