518 



TUMORS. 



The bundles of smooth muscles are either scattered irregu- 

 larly throughout the tumor, always interlacing in different direc- 

 tions, as shown by sections, or there is a lobular structure when 

 nodules containing many smooth muscles, but little connective 

 tissue, are separated from each other by comparatively . broad 

 layers of fibrous connective tissue. In bundles of smooth mus- 

 cle-fibers, cut longitudinally, the muscle nature of the fibers is 

 often unrecognizable, as they blend with those of connective tis- 

 sue, while in transverse sections of the bundles all doubts of the 



FIG. 213. MYO-FIBROMA OF THE UTERUS. 



L, bundles of smooth muscle-fibers cut longitudinally ; F, bundles of smooth muscle- 

 fibers cut transversely; A, artery with a very broad muscle-coat; V, vein. Magnified 200 

 diameters. 



muscle nature of the fibers are removed, owing to the presence 

 of abundant bioplasson and rod-like nuclei within the spindles, 

 separated from one another by a delicate fibrous perimysium. 

 One of the most striking features, in some cases, is the heavy 

 muscle-coat surrounding the arteries. (See Fig. 214.) 



