LECTURE XV. 



OO4: 



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 me 

 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 1 

 direction of the muscular fibres, which may reim 

 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 gastrocnemn are 

 examined, we find nothing but a yellowish mass exhi- 

 biting scarcely any stri* and without any appearance 

 of flesh, but upon a more minute examination it is du 

 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). //. Rows of inters* 

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



