SYSTEMATIC SYNTHESIS OF TISSUES INTO ORGANS. 237 



442. THE RED COLOR of the contractile part is owing 

 to the Blood that is in it ; hence it has different colors in 

 different animals. 



443. Illus. THE DRUMSTICK OP A FOWL EXHIBITS in an admirable 

 manner a bundle of muscles, with their fleshy and sinewy parts. 



444. ANY PIECE OF LEAN MEAT CAN BE EASILY DI- 

 VIDED in one direction into stringy fibres, which, by the 

 use of appropriate instruments, can be subdivided till 

 fibrils are reached, not so large as hairs, composed of an 

 exceedingly delicate sheath, like basement membrane, 

 enclosing still more delicate fibrillaB composed of cells, 

 or minute particles of a beaded form placed end to end. 



445. Commencing with the delicate cellular fibrillse, 

 A MUSCLE is CONSTRUCTED by enveloping a small bun- 

 dle of them in a membranous homogeneous sheath, 

 and forming a fibril. A bundle of fibrils placed side 

 by side, and enclosed in a sheath of sinewy membrane, 

 forms a fasciculus. 



446. ALL THE FIBRILLJB in a fibril and all the fibrils 

 in a fasciculus are parallel, but fasciculi may not be, in- 

 deed seldom are, perfectly so. 



447. Inf. FASCICULI MAY BE CONSIDERED as the elements of mus- 

 cles, and a single one may constitute an entire muscle. 



FIG. 175. 



Fig. 175 represents several fasciculi 

 cut across, their contained fibrils, and 

 the containing sheath, each fibril being 

 composed of several fibrillse too small to 

 be represented. 



448. WHEN MUSCLES ABOVE THE SMALLEST SIZE ARE 

 TO BE FORMED, fasciculi are gathered into larger or 



442. What said of ? 443. What does ? 444. How can ? 445. How ? 

 446. What said ? 447. How ? Describe Fig. 175. 448. What said - ? 



